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Really slow IMAP and SMTP access

Hi I have an ASA 5505 on the mail server side. When I am remote and access mail via IMAP and SMTP, there is a rather long delay, approx 10-15 sec before it sends an email and slightly less when connecting via IMAP into the mailboxes. Mostly thunderbird as a client.

When Im on location on the 'inside', it is lightning fast. Im pretty sure there is nothing wrong with the server, maybe something in my ASA config? I am attaching it if anyone has any ideas.

Thank you!

Bob

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