SMTP Not Working After Migration to New Server

[codecircuit]

We migrated SuiteCRM to a new server. SMTP settings were working before but now emails fail silently. No errors in logs. What could be the problem?
I don’t know what I am missing here.

[pgr]

This might help you get more information:

Office 365 Suite v 7.10.7 Ubuntu 16.04

I think it is critical to know which problem your SMTP is encountering. Uncomment this line and check (in the logs, when sending test email) that the values are correct just before being sent to the server: https://github.com/salesagility/SuiteCRM/blob/master/include/SugarPHPMailer.php#L444 Next, uncomment these lines to get an extensive log of your SMTP interaction with the server. It should provide you with an exact error. https://github.com/salesagility/SuiteCRM/blob/master/include/SugarP…

[pstevens]

@pgr suggestion is a good one to get specific info, but here are a few things I would check in addtion:

1. PHP version is correct
2. PHP memory limit it correct
3. PHP options required are enabled.
4. PHP time limit
5. Your server allows outbound SMTP connections (fire wall)
6. Your host allows SMTP connections through their relay
7. Your SPF records are configured properly to allow new IP of new server
8. You have your email routing configured properly in WHM (if you’re using WHM/Cpanel)
9. You have transport=dkim_remote_smtp setup if using WHM/Cpanel in tweak settings.
10. Your new host may have different SMTP ports.

Those are my top 10.

[rsp]

@pstevens

PHP version is correct

Compatibility Matrix

[catherine]

Check if IMAP extension is installed:

php -m | grep imap

If you see output like imap, then it’s already installed.

If it is missing:

sudo apt update
sudo apt install php-imap

Enable IMAP extension

sudo phpenmod imap

Finally, restart the web server:

sudo systemctl restart apache2