Lprager,
Because you have presented a solution to your own problem which may be helpful to future searches, this question is now PAQed and your points have been refunded.
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Trend Micro IMSS v7.0 - Cannot relay 8 bit MIME to downstream mail server
We have upgraded Trend Micro Interscan Messaging Security Suite - IMSS to version 7.0.
Now we have numerous, non-spam, inbound emails that are not being delivered. These messages all show in the MTA Events as "Message... not relayed yet".
The tsmtpd.log for the period shows the following error for these emails:
"CSmtpClientChanel::_Conne
I have modified the tsmtpd.ini file (as per a suggestion from Trend Micro support) to prevent acceptance of 8bitMIME:
# 8.5
# If 0, then 8BITMIME (RFC 1652) disabled.
#
#Enable8BitMIME=1
Enable8BitMIME=0
The theory is that if 8 bit mime is disabled then IMSS will not receive it and therefore not have problems forwarding it to the downstream mail server. (I suppose the originating mail server should recognize that SMTP on IMSS does not accept 8bit and therefore deliver 7bit instead.)
After restarting the server, this change did not help. I still get the error.
Next I tried a setting from the older version, 5.7, which would convert 8bit mime to 7bit for downstream mail servers that no not support 8 bit. I made the following entry in tsmtpd.ini:
# 8.5a (added by Lance Prager, Computer Upgrades, 5/21/07)
# if Yes then 8-bit Mime messages are automatically converted to 7-bit for
# downstream MTA
#Transfer827=yes
Transfer827=1
(I also tried Transfer827=yes). After restarting the server, none of this had any effect either.
I am begining to think I am the only user foolish enough to upgrade from 5.7 to 7.0 so I am really the beta tester. If there is anyone else who has experience with version 7.0 of IMSS and can help me resolve this problem I would be eternally grateful. I have been suffering through Trend Micro tech support for days and they really do not seem to know any more about this product than I do (and there is no documentation past the getting started guide).
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by: LpragerPosted on 2007-05-23 at 15:33:04ID: 19145551
OK, 500 points to me!
Version 7.0 does not support Transfer827 at this time so if it advertises 8BITMIME it will try to send it downstream. If downstream is only 7bit then the messages get stuck in the MTA queue and retry up to 48 times each before being deleted without delivery.
So, even after setting Enable8BITMIME=0 you will still get the MTA "Message... not relayed yet" error. No more inbound mail is accepted as 8bit but the error will persist until the message queue is cleared of all the old 8 bit messages.