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The following error message can be seen in
/var/log/maillog:Mar 12 03:33:20 webhosting postfix/smtp[653]: 4D49C7EA0E: to=test@test.com, relay=smtp.sendgrid.net[13.114.210.107]:587, delay=1.6, delays=0.01/0.01/1.3/0.35, dsn=5.0.0, status=bounced (host smtp.sendgrid.net[13.114.210.107] said: 550 The from address does not match a verified Sender Identity. Mail cannot be sent until this error is resolved. Visit https://sendgrid.com/docs/for-developers/sending-email/sender-identity/ to see the Sender Identity requirements (in reply to end of DATA command))
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The forwarding feature is enabled in Plesk UI for the affected mail account in Domains > example.com > Mail > Mail Accounts > mail@example.com > Forwarding
Cause
With forwarding enabled in Plesk, the "from" header uses the original sender email address, but SendGrid expects the forwarder domain name in this header. Hence, SendGrid is rejecting mail.
It is expected behavior in Plesk for the forwarding to use the original "from" email address.
Resolution
One of the following options is available for forwarding emails with SendGrid:
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Configure forwarding in webmail or mail client interface - the instructions will vary depending on a particular webmail/mail client software. It works differently and will use another "from" header, meaning that it should be accepted by SendGrid.
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Contact SendGrid support and clarify if they can suggest any options to allow/verify email, keeping in mind that "from" header contains an address different from the verified domain because of forwarding.