Why does SMTP seem to be so slow?

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There are a variety of reasons why this may be the case including your license, disk fragmentation, threads, server load, network traffic, hard disk issues, or anti-spam settings. One issue in particular that was causing trouble was that GMS was doing a lookup on all mail passed via SMTP regardless of whether it was local or not.

We have changed this and SMTP now only does a lookup where the RCPT is local.

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Keywords:smtp slow delay incoming

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