500 Line too long

Have a client who has an e-mail bouncing with following:

undeliverable to name@company.com

Body of message generated response:
500 Line too long

then gives the original message.

I can telnet into the server.  Other e-mails are arriving.  Watchguard firewall with spamblocker in place.

Thanks
scoobyftlAsked:
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dpk_walConnect With a Mentor Commented:
As already explained by pwrBall what 500 line too long means; if you wish we can adjust the value in the firewall policy to solve the problem as below:
In Policy Manager; edit the SMTP-proxy service; go to Properties; under Proxy Action; click View/Edit Proxy; under Limits; you have "Set the maximum e-mail line length to"; here you can either uncheck the option to disable this check or increase the size from the default value of 1000 [max value 999999].

Thank you.
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pwrBallConnect With a Mentor Commented:
This problem occurs if the e-mail that you sent has more than 999 continuous characters in the e-mail  message body.

Some e-mail systems use an unsolicited commercial e-mail (UCE) filter that may be configured to reject e-mail activities that have more than 999 consecutive characters in the body of the e-mail message.
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