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Deliverability is a term for the probability that an email ends up in its recipients' inbox, rather than a spam folder.

Why did my email sent from Purelymail get marked as spam?

Most mail providers will consider the following factors when determining whether or not an email is spam:

How can I improve my custom domain's deliverability?

I tried to send an email, but got a message that it was rejected!

Please forward any such reject messages to contact@purelymail.com and we can take a look. This is likely the result of a block-happy mail provider rejecting the message at delivery time, and probably just requires some manual unblocking steps.

What mail providers am I likely to run into issues with?

We're aware of issues with mail being marked as spam by Microsoft Outlook and related services.