The easiest way to find out what happened to a lost email is to approach the problem from both sides. Look at your email settings and ask your recipients to do the same. Here are the first steps you should take:
Things can be a bit trickier when working in the corporate domain. There are likely to be a lot more restrictions/hurdles before we reach the intended recipient's inbox. All the above possibilities apply here as well but there are additional cases to look out for as well.
Firewalls - Usually corporate networks have firewalls set up to filter out unsolicited emails. To make your emails pass the firewalls, get in touch with your corporate subscriber directly.
Post Office Protocol (POP) and Internet Message Access Protocol (IMAP) are what allow you to download emails from a remote server. If you have not integrated your device with one of these protocols, then you may not receive email notifications. Go for the protocol that best suits you and integrate it with your devices.
Email address validation issues can cause your emails to bounce. Make sure that there are no errors or defunct addresses in your mailing lists.
Your email may be quarantined by the recipient's email server. This can happen if your recipient's inbox is full, if you are sending from an unverified address, or if your domain has spam complaints against it. In these cases, you should try to get in contact with your subscriber about it.
It's easy to be impatient when you're sending out an exciting new campaign. You may be surprised to learn that when it comes to campaigns, emails may not be delivered instantaneously. Try checking on your campaign again later, you may find that it just needed some time.
If you send messages either too frequently or infrequently, you run the risk of having emails sent to the spam folder. A good baseline is no more than two emails per week and no less than one per month.
A temporary failure where the target mail server returns an SMTP error code between 400 and 499 means the mail server is temporarily unable to accept your email message. When you receive this error, the most likely case is that the recipient's server is busy. Usually, mail servers will try again for up to 5 days before giving up. After 4 hours, they usually send a notice back to the sender explaining why there is a delay.
A permanent failure returns an SMTP error code between 500 and 599. This code means that the mail server will not accept delivery of this message and it should be returned to sender without further attempts to deliver. Some reasons for these errors include:
Permanent errors generate a delivery failure message that is sent back to the sender.
The best solution for every deliverability issue is to ask your subscribers to add you to their contact list. This will remove the chances of being stopped or blocked by most filters and anti-spam software.
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