SMTP Taking Ages to send.

Check your Exim logs as to what is going on. Mostly one can see from there what is happening and might cause the issue.

Could also be limits from your hoster/datacenter.

Without any additional information it's almost not doable to be of any help.
Also check https://www.mail-tester.com/ and send a mail by using the instructions there. If you have no 10/10 score, tell us why not (and/or show screenshot).
 
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