“connection to the server was interrupted”

125 pts.
Tags:
Exchange 2007
Exchange error messages
Forefront Client Security
hi, I have exchange 2007 SP1 enterprise edition on HP DL 380 G5 server with 4 GB RAM. installed antispam agents and microsofoft forefront security for exchange 2007 SP1. configured everything right as per the book. my main problem that mu clients are using POP3/SMTP accounts over GPRS connection. the problem is when I send mail larger than 700 Kb it takes like for ever and then in the end it gives the error >> "connection to the server was interrupted" I experience the same situation if I'm using ADSl connection but for mails larger than 15 MB. I reviewed everything and everything seems well. I have 1 MB 1:1 SDSL connection for the server any recommendation???
ASKED: April 22, 2008  3:46 PM
UPDATED: April 23, 2008  1:37 PM

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i found that switching to port 578 that is already created in exchange.
it will perform bestter because ISPs maybe blocking port 25 even if it’s secure.
i will love to hear more suggestions….

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