Making Email More Secure: Understanding DKIM and SPF

Making Email More Secure: Understanding DKIM and SPF

Imagine you’re sending an important letter to a friend. You write your message, put it in an envelope, and drop it in the mailbox with your address (From Address) and your friend's address (To Address). But what if someone along the way tampers with your letter, changes the contents, or even forges a letter pretending to be you? Your friend might receive a completely different message, or worse, never get it at all.



This is exactly the kind of problem businesses face with email security. Just like traditional letters, emails can be intercepted, modified, or forged. To protect email communication, organizations use two important security measures: DKIM (DomainKeys Identified Mail) and SPF (Sender Policy Framework).
Zylker Techfix encountered a major issue without these security measures : customers weren’t receiving support emails. Some emails bounced back, while others landed in spam folders. Without DKIM and SPF, email providers couldn’t verify whether Zylker’s emails were genuine or forged.

Understanding DKIM

Like official letters have signatures or company seals to prove authenticity, DKIM (DomainKeys Identified Mail) does the same for emails.

DKIM : The Signature Seal for Emails

  • DKIM attaches a cryptographic signature to every email you send.
  • When the recipient’s email service (like Gmail, Outlook, or Yahoo) gets the email, it checks this signature against your company’s domain records.
  • If the signature matches, the email is verified as authentic and delivered safely.
  • If the signature is missing or doesn’t match, the email might get rejected or marked as spam.

Adapting Custom SMTP for Public Domains

Using email forwarding and two-factor authentication, Zylker Techfix used public domains like Microsoft and Google with Zoho SMTP. Configuring DKIM was not the solution in this case; instead, the Custom SMTP setup within Zoho Desk resolved the issue. To further enhance security, they could enable Custom SMTP OAuth for a passwordless configuration.

Why did Zylker Techfix Implement DKIM?

Zylker Techfix used organization-level email addresses from a domain procured through their official website. These addresses were used by different departments. However, they faced email bounces due to authentication failures when sending messages via Zoho’s servers. This disrupted their customer support services, as bounced emails prevented ticket creation.
To resolve this, they enabled DKIM authentication in Zoho Desk. The setup was simple:
  1. Added the DKIM public key as a TXT record in their DNS settings.
  2. Verified the key using the "Verify" option in Zoho Desk.
  3. Ensured all outgoing emails carried the DKIM signature to authenticate email communications.
By enabling DKIM, Zylker Techfix significantly improved email deliverability, reduced email tampering, and prevented spoofing.

Understanding SPF

Now imagine you’re sending the package to your friend through a trusted courier service like FedEx or UPS. If someone tries to deliver a fake package using their branding, the courier service will refuse to accept it.
SPF (Sender Policy Framework) works in the same way—it ensures that only authorized mail servers can send emails on behalf of your domain.

SPF: The "Authorized Courier"

  • SPF acts as a list of trusted email servers that are allowed to send emails from your domain.
  • When an email is received, the recipient's email provider checks whether it came from an authorized server.
  • If the email comes from a trusted source, it is delivered; else it is rejected or marked as spam.

How did Zylker Techfix implement SPF?

Set up SPF by specifying specified email services as their authorized email senders.
To improve security, Zylker Techfix set up SPF records to tell email providers:
"Only emails sent from Authorized email servers should be considered legitimate. If an email comes from another server, don’t trust it!"

The Benefits
Setting up SPF prevented spam, fraudulent emails, and email spoofing while ensuring better email deliverability. 
After implementing DKIM and SPF, email deliverability improved, customers received emails without issues, and communication became more secure and professional.

Final Thoughts for Every Business
Whether you’re a small startup or a large enterprise, email security matters. Without DKIM and SPF, your business risks lost emails, email spoofing or tampered messages. 
Enable DKIM and SPF today!





      Zoho Campaigns Resources


        • Desk Community Learning Series


        • Digest


        • Functions


        • Meetups


        • Kbase


        • Resources


        • Glossary


        • Desk Marketplace


        • MVP Corner


        • Word of the Day


        • Ask the Experts


          • Sticky Posts

          • Register for Zoho Desk Beta Community

            With the start of the year, we have decided to take a small step in making the life of our customers a little easier. We now have easy access to all our upcoming features and a faster way to request for beta access. We open betas for some of our features
          • Share your Zoho Desk story with us!

            Tell us how you use Zoho Desk for your business and inspire others with your story. Be it a simple workflow rule that helps you navigate complex processes or a macro that saves your team a lot of time; share it here and help the community learn and grow with shared knowledge. 
          • Tip #1: Learn to pick the right channels

            Mail, live chat, telephony, social media, web forms—there are so many support channels out there. Trying to pick the right channels to offer your customers can get pretty confusing. Emails are most useful when the customer wants to put things on record. However, escalated or complicated issues should not be resolved over email because it's slow and impersonal.  When you need immediate responses, live chat is more suitable. It's also quick and convenient, so it's the go-to channel for small issues. 
          • Welcome to Zoho Desk Community - Say hello here!

            Hello everyone! Though we have been here for a while, it’s time to formally establish the Zoho Desk Community; we’re really happy to have you all here! This can be the place where you take a moment to introduce yourself to the rest of the community. We’d love to hear all about you, what you do, what company or industry you work for, how you use Zoho Desk and anything else that you will like to share! Here’s a little about me. I am Chinmayee. I have been associated with Zoho since 2014. I joined here
          • Webinar 1: Blueprint for Customer Service

            With the launch of a host of new features in Zoho Desk, we thought it’ll be great to have a few webinars to help our customers make the most of them. We’re starting off with our most talked about feature, Blueprint in Zoho Desk. You can register for the Blueprint webinar here: The webinar will be delivered by our in-house product experts. This is a good opportunity to ask questions to our experts and understand how Blueprint can help you automate your service processes. We look forward to seeing

          Zoho CRM Plus Resources

            Zoho Books Resources


              Zoho Subscriptions Resources

                Zoho Projects Resources


                  Zoho Sprints Resources


                    Zoho Orchestly Resources


                      Zoho Creator Resources


                        Zoho WorkDrive Resources



                          Zoho CRM Resources

                          • CRM Community Learning Series

                            CRM Community Learning Series


                          • Tips

                            Tips

                          • Functions

                            Functions

                          • Meetups

                            Meetups

                          • Kbase

                            Kbase

                          • Resources

                            Resources

                          • Digest

                            Digest

                          • CRM Marketplace

                            CRM Marketplace

                          • MVP Corner

                            MVP Corner




                            Zoho Writer Writer

                            Get Started. Write Away!

                            Writer is a powerful online word processor, designed for collaborative work.

                              Zoho CRM コンテンツ




                                ご検討中の方

                                  • Recent Topics

                                  • open word file in zoho writer desktop version

                                    "How can I open a Microsoft Word (.doc or .docx) file in Zoho Writer if I only have the file saved on my computer and Zoho Writer doesn't appear as an option when I try 'Open with'? Is there a way to directly open the .doc file in Zoho Writer?"
                                  • Adding contact role to a specific deal js sdk malfunctioning

                                    i was trying to add the contact role to a specific deal contact but repeatedly i am getting this error: { "code": "SUCCESS", "details": { "statusMessage": { "code": "INVALID_DATA", "details": { "expected_data_type": "jsonobject" }, "message": "body",
                                  • How to invite friends on other social media platforms to one of my group chats in arattai?

                                    Hello, I have formed chat groups in arattai. I want to invite my friends on other social media platforms like WhatsApp/ FB to one of my groups. Different friends would be invited to different groups. How to share an invite link of one of my groups to
                                  • Zoho PDF editor has a lot of issues.

                                    Zoho PDF editor needs a lot of work. It hangs and glitches a lot. Deletes annotations and clearings randomly.
                                  • So we ran with it for the week

                                    In our company i bit the bullet and ran with FSM for a whole week. Service calls, deliveries and surveys. Covering about 30-120 miles a day to domestic properties. Loved the appointment list and satnav integration. Loved the timer to measure the appointments.
                                  • link to any Belgian bookkeeping software?

                                    Hello, Does anyone on this Forum can help me with the question whether the ZOHO CRM (Invoices) or ZOHO Book can be linked to software that is used for Belgian Bookkeeping/accountancy? By linking, I mean either with the help of a middleware program or either by the ability to export the custom made reports as CSV-files... If someone has an experience with online CRM-Accountancy in Belgium, with ZOHO (or other), it would be great to read it... Thank you
                                  • Client Script | Update - Introducing Subform Events and Actions

                                    Are you making the most of your subforms in Zoho CRM? Do you wish you could automate subform interactions and enhance user experience effortlessly? What if you had Client APIs and events specifically designed for subforms? We are thrilled to introduce
                                  • Kaizen #152 - Client Script Support for the new Canvas Record Forms

                                    Hello everyone! Have you ever wanted to trigger actions on click of a canvas button, icon, or text mandatory forms in Create/Edit and Clone Pages? Have you ever wanted to control how elements behave on the new Canvas Record Forms? This can be achieved
                                  • how to use validation rules in subform

                                    Is it possible to use validation rules for subforms? I tried the following code: entityMap = crmAPIRequest.toMap().get("record"); sum = 0; direct_billing = entityMap.get("direct_billing_details"); response = Map(); for each i in direct_billing { if(i.get("type")
                                  • Global Sets for Multi-Select pick lists

                                    When is this feature coming to Zoho CRM? It would be very useful now we have got used to having it for the normal pick lists.
                                  • stock

                                    bom/bse : stock details or price =STOCK(C14;"price") not showing issue is #N/A! kindly resolve this problem
                                  • Zoho sheet desktop version

                                    Hi Zoho team Where can I access desktop version of zoho sheets? It is important as web version is slow and requires one to be online all the time to do even basic work. If it is available, please guide me to the same.
                                  • ZOHO SHEETS

                                    Where can I access desktop version of zoho sheets? It is important to do basic work If it is available, please guide me to the same
                                  • Option to Empty Entire Mailbox or Folder in Zoho Mail

                                    Hello Zoho Mail Team, How are you? We would like to request an enhancement to Zoho Mail that would allow administrators and users to quickly clear out entire folders or mailboxes, including shared mailboxes. Current Limitation: At present, Zoho Mail only
                                  • Zoho Books - France

                                    L’équipe de Zoho France reçoit régulièrement des questions sur la conformité de ses applications de finances (Zoho Books/ Zoho Invoice) pour le marché français. Voici quelques points pour clarifier la question : Zoho Books est un logiciel de comptabilité
                                  • Using Zoho Flow to create sales orders from won deal in Zoho CRM

                                    Hi there, We are using Zoho Flow to create sales orders automatically when a deal is won in Zoho CRM. However, the sales order requires "Product Details" to be passed in "jsonobject", and is resulting in this error: Zoho CRM says "Invalid input for invalid
                                  • Is Zoho Sheet available for Linux ?

                                    Is Zoho Sheet available for Linux ?
                                  • how to disable staff selection Zoho Booking integrated to SalesIQ?

                                    currently there is only one Consultant in my Zoho Bookings like this I integrate Zoho Bookings into Zoho SalesIQ to create a chatbot. Unfortunately, even though I only have one consultant for a consultation, the user have to pick the consultant. It will
                                  • Zoho Bookings No Sync with Outlook

                                    Zoho Bookings appointments are showing on my Outlook Calendar but Outlook events are not showing on Zoho Bookings. How do I fix this?
                                  • End Date in Zoho Bookings

                                    When I give my appointments a 30 minutes time I would expect the software not to even show the End Time.  But it actually makes the user pick an End Time.  Did I just miss a setting?  
                                  • Custom confirmation message

                                    How can I change the message that users see after they submit the booking form? I have to confirm some details before their appointment is officially "confirmed", so I want to change it where it doesn't say their appointment is "confirmed" but rather
                                  • Issue showing too many consultations in my workspace link.

                                    Hi Team, I’ve set up two Workspaces to track meetings from different sources. So far, this has been working well, and the two Workspaces are differentiated without any issues. However, when I navigate to Consultations and share the link to my personal
                                  • All new Address Field in Zoho CRM: maintain structured and accurate address inputs

                                    The address field will be available exclusively for IN DC users. We'll keep you updated on the DC-specific rollout soon. It's currently available for all new sign-ups and for existing Zoho CRM orgs which are in the Professional edition. Managing addresses
                                  • Recurring Supervisor Rule Reminders for Open/In-Progress Tickets

                                    Hello Zoho Support Team, I would like to suggest a potential improvement regarding reminders for tickets and activities in Zoho Desk. Currently, it is possible to set reminders only once. In the Supervisor Rules section, it is possible to configure reminders
                                  • Improved RingCentral Integration

                                    We’d like to request an enhancement to the current RingCentral integration with Zoho. RingCentral now automatically generates call transcripts and AI-based call summaries (AI Notes) for each call, which are extremely helpful for support and sales teams.
                                  • Deluge sendmail in Zoho Desk schedule can't send email from a verified email address

                                    I am trying to add a scheduled action with ZDesk using a Deluge function that sends a weekly email to specific ticket client contacts I've already verified the email address for use in ZDesk, but sendmail won't allow it in its "from:" clause. I've attached
                                  • Zoho Learn & Zoho Connect

                                    Hi, Is there a way to sync the knowledge base we have in Zoho Learn with the manuals section is Zoho Connect? Thanks,
                                  • Addin Support in Zoho Sheet

                                    Is there any addin support available in zoho sheet as like google marketplace to enhance productivity by connecting with other apps, providing AI data analysis, streamlining business processes, and more?
                                  • Allow syncing Activities from other applications

                                    Marketing Automation could be a much more powerful platform if you were able to sync activities into the platform (e.g. purchase, donation, etc) outside of a user doing something on your website. I'd love it if you could sync Custom CRM Modules as activities,
                                  • Changing Corporate Structure - How Best to Adapt Current and Future Zoho Instances

                                    My current company is Company A LLC with a dba ("doing business as" - essentially an alias) Product Name B. Basically, Company A is the legal entity and Product Name B is what customers see, but it's all one business right now. We currently have a Zoho
                                  • how to add subform over sigma in the CRM

                                    my new module don't have any subform available any way to add this from sigma or from the crm
                                  • {"errors":[{"id":"500","title":"Servlet execution threw an exception"}]}

                                    Here's the call to move a file to trash. The resource_id is accurate and the file is present. header = Map(); header.put("Accept","application/vnd.api+json"); data = Map(); data_param1 = Map(); att_param1 = Map(); att_param1.put("status",51); data_param1.put("attributes",att_param1);
                                  • How to Install Zoho Workdrive Desktop Sync for Ubuntu?

                                    Hi. I am newbie to Linux / Ubuntu. I downloaded a tar.gz file from Workdrive for installing the Workdrive Desktop Sync tool. Can someone give me step by step guide on how to install this on Ubuntu? I am using Ubuntu 19.04. Regards Senthil
                                  • Integración Books para cumplir la ley Crea y Crece y Ley Antifraude (VeriFactu)

                                    Hola: En principio, en julio de 2025, entra en vigor la ley Crea y Crece y Ley Antifraude (VeriFactu). ¿Sabéis si Zoho va a cumplir con la ley para cumplir con la facturación electrónica conectada a Hacienda? Gracias
                                  • How to upload own video?

                                    How can you upload your own video on your zoho website? I do not want to use another host, but i want to insert my own files. how can i do this?
                                  • Support new line in CRM Multiline text field display in Zoho Deluge

                                    Hi brainstrust, We have a Zoho CRM field which is a Muti Line (Small) field. It has data in it that has a carriage return after each line: When I pull that data in via Deluge, it displays as: I'm hoping a way I can change it from: Freehand : ENABLED Chenille
                                  • A couple of minor enhancements to Workflows

                                    Last updated on September 17, 2024: These enhancements were initially available for early access, and we've now enabled them for all users. We are elated to announce a couple of enhancements to custom functions in our Workflows! Say hello to: "Source"
                                  • Announcing new features in Trident for Windows (v.1.32.5.0)

                                    Hello Community! Trident for Windows just got better! This update includes new features designed to improve and simplify email and calendar management—and it includes a feature you’ve been waiting for. Let’s dive into what’s new! Save emails in EML or
                                  • How to render either thumbnail_url or preview_url or preview_data_url

                                    I get 401 Unauthorised when using these urls in the <img> tag src attribute. Guide me on how to use them!
                                  • Zoho CRM Calendar | Custom Buttons

                                    I'm working with my sales team to make our scheduling process easier for our team. We primary rely on Zoho CRM calendar to organize our events for our sales team. I was wondering if there is a way to add custom button in the Calendar view on events/meeting
                                  • Next Page