Emails taking a long time to send from DirectAdmin server

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If you notice that outbound emails from your server are taking hours to send, it may be caused by the blockcracking configuration. This is a very easy fix.

Step 1: Open /etc/exim.blockcracking/variables.conf.custom

Step 2: Add this to the file:

BC_VERIFY_CALLOUT ==callout=10s,maxwait=40s,connect=5s,defer_ok,use_sender

Step 3: Restart exim with:

systemctl restart exim

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