How to handle a blacklisted sender domain

How to handle a blacklisted sender domain

Blacklists are lists of email senders who are known to send spam. These lists are maintained by internet service providers, anti-spam services, and mailbox providers. When it comes to offering inbox placement, mailbox providers give preference to emails from senders who are not blacklisted. A sender domain will get blacklisted when its emails receive complaints, spam markings, unsubscribes, etc.

How to find out if your sender domain is blacklisted

When your sender domain gets blacklisted, the emails you send will either bounce or land in the spam folder. We always recommend you verify the health of your sender domain using tools like MXToolbox before sending a campaign.

What to do if your sender domain gets blacklisted

If your sender domain gets blacklisted, is it the end of the road? Definitely not. When your sender domain gets blacklisted, we urge you to pause sending campaigns and resolve the issue as soon as possible. We recommend you resume sending emails only after your sender domain is delisted.

Submitting a delist request

When your sender domain gets blacklisted, you need to submit a delist request to the mailbox provider/anti-spam service that blacklisted it. If the mailbox provider/anti-spam service finds the explanation to be valid, they will delist the sender domain. You need to understand that delisting the sender domain may take some time and it varies with each mailbox provider and anti-spam service.

How to avoid getting blacklisted

The best way to prevent your sender domain from getting blacklisted is by adopting hygienic email sending practices and maintaining quality mailing lists.

Avoid hitting spam traps

One of the major reasons for a sender domain getting blacklisted is when sent emails hit spam traps. Your emails may hit spam traps when you use purchased mailing lists. Also, mailbox providers use expired email addresses and unused email addresses as spam traps. So, it is always advisable to prune your mailing list every six months to ensure that the mailing list doesn't contain such spam traps.

Don't use spammy phrases, blacklisted URLs, and shortened URLs

The receiving servers of mailbox providers will scan the email content to identify patterns that point towards spam. If your emails contain spam phrases, blacklisted URLs, or shortened URLs, the receiving server may blacklist your sender domain.

Never leave deliverability issues unresolved

After sending a campaign, you need to monitor its performance. If the campaign receives spam markings or unsubscribes, you need to perform a grassroots-level analysis and resolve the issue immediately. You need to adopt hygienic email marketing practices to prevent the issue from cropping up again. If you leave deliverability issues unresolved, they may lead to your sender domain getting blacklisted.

Don't leave inactive contacts unattended

If your mailing list contains a lot of inactive contacts, they might mark your emails as spam. So, we always recommend our users identify inactive contacts and win them back by sending re-engagement campaigns. While crafting re-engagement campaigns, use attractive subject lines, list the benefits of staying on your mailing list, offer discounts, and ask the contacts if they are interested in receiving your emails. You can retain contacts who decide to stay on your mailing list and remove contacts who don't respond to your re-engagement campaign.

Keep your contacts engaged

The only way to prevent contacts from negatively engaging with your emails is by offering content that's relevant to their needs and interests. To do this, you need to analyze their purchase history and the links they clicked in your previous emails. Once you identify what your contacts are interested in, you can segment contacts based on their interests and start nurturing them. When you offer content that excites your contacts, they will look forward to receiving your emails and will not negatively engage with them.

Click here to learn more about keeping your contacts engaged.

Maintain a healthy email volume and frequency

The receiving servers of all mailbox providers have set a threshold value for emails they receive per hour/day. If your email volume exceeds the threshold value, the receiving server will reject your email and may even blacklist your sender domain. Hence we always urge businesses to maintain optimal email volume and frequency. We recommend businesses split their email volume and send them in batches.

At Zoho Campaigns, we have a feature for sending campaigns in batches. You can click here to learn more about this feature.

Use the double opt-in technique to grow your mailing list

When you use the single-opt-in technique, invalid email addresses may get added to your mailing list. When you send emails to such addresses, your emails may bounce or hit spam traps. The only way to prevent this is by using the double-opt-in technique, which sends an initial follow-up email to the address asking the person to verify that they did indeed sign up for the mailing list. The double opt-in technique will ensure that only interested contacts enter your mailing list and prevent email bounces and spam trap hits.

Getting their sender domain blacklisted is the last thing marketers want. The only way to prevent a sender domain from getting blacklisted is by adopting hygienic email sending practices and keeping contacts engaged.

    Zoho DataPrep Personalized Demo

    If you'd like a personalized walk-through of our data preparation tool, please request a demo and we'll be happy to show you how to get the best out of Zoho DataPrep.

    Zoho CRM Training

      Create, share, and deliver

      beautiful slides from anywhere.

      Get Started Now





              Zoho CRM Training Programs

              Learn how to use the best tools for sales force automation and better customer engagement from Zoho's implementation specialists.

              Zoho CRM Training

                  Zoho SalesIQ Resources



                      Zoho TeamInbox Resources




                                Zoho DataPrep Resources

                                  Zoho DataPrep Demo

                                  Get a personalized demo or POC

                                  REGISTER NOW


                                    Design. Discuss. Deliver.

                                    Create visually engaging stories with Zoho Show.

                                    Get Started Now











                                                          • Related Articles

                                                          • Why a new domain won’t fix a blacklisted domain

                                                            The user manual of every email marketing software solution says, “We don’t recommend sending emails from multiple domains.” Though a simple statement, given the subject’s abstractness, we wanted to give you a detailed explainer why this is true.   ...
                                                          • How a public domain sender address affects email deliverability

                                                            Whenever you send campaigns, they will be delivered to the receiving server of the respective mailbox provider. The receiving server will offer inbox placement after carefully scrutinizing the email. If the emails are from a source that the mailbox ...
                                                          • Getting started with email deliverability

                                                            Identifying the needs and interests of contacts and conceptualizing email campaigns around those are part and parcel of a marketer's daily routine. Sometimes marketers may assume that crafting a compelling campaign alone will help them hit their ...
                                                          • Steps to authenticate your sender domain

                                                            At Zoho Campaigns, we strongly urge you to authenticate your domain by implementing SPF and DKIM.   SPF Sender Policy Framework is an authentication technique that helps receiving email servers identify legitimate email senders and prevent spam ...
                                                          • Eight common practices that affect email deliverability

                                                            Email deliverability is the ability to land emails in the inbox of your recipients. If your campaign's deliverability takes a hit, it might be due to certain email marketing practices you follow. Let's dive deep and learn about practices that affect ...

                                                          Resources

                                                          Videos

                                                          Watch comprehensive videos on features and other important topics that will help you master Zoho CRM.



                                                          eBooks

                                                          Download free eBooks and access a range of topics to get deeper insight on successfully using Zoho CRM.



                                                          Webinars

                                                          Sign up for our webinars and learn the Zoho CRM basics, from customization to sales force automation and more.



                                                          CRM Tips

                                                          Make the most of Zoho CRM with these useful tips.



                                                            Zoho Show Resources