Moved website hosting to new EC2, now workmail smtp rejects emails from the website on new EC2 server

Question

Recently changed website DNS A records to new EC2 IP, but why emails to SMTP from new server (website contact us form) are being rejected by workmail? works fine on old server and from desktop email client.

All DNS records seem to be set correctly as it works from the old EC2 IP. The website SMTP client is setup correctly as on old website.

Seems mail server is not authorized to send mail for the specified domain?

Reject Email from AWS workmail server:
Unfortunately, the system was unable to deliver your mail.
The error given was:

You are not allowed to send as user or group IT

You may need to contact your e-mail administrator to solve this problem.
Reporting-MTA:

Final-Recipient: 
Action: failed
Status: 5.0.0

Answer

Thank you Robin, like you said the issue was the new website smtp mailer was using login user and trying to send email from different email address, causing smtp server to say you don't have permission to send from this email.

Answer

Hi,

The error you received is due to permissions. You're trying to send a email as another user or group but lack the permissions to do so. You can give the user you've used permission to send as or send on behalf of in the WorkMail console. You can find more information in the documentation [here](https://docs.aws.amazon.com/workmail/latest/adminguide/enable_mail_perms.html)

Kind regards,
Robin

Answer

Like I said the same email works fine from old server and from desktop email clients, but the same email setting doesn't work from new server IP, so it is not email user permission. Is it possible that is warming an IP for SMTP? but it been 2 weeks.

Moved website hosting to new EC2, now workmail smtp rejects emails from the website on new EC2 server

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