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Undelivered Mail: 501 Syntax error in parameters or arguments

Tolik

Hello everybody,

we send and receive mail via sophos central
We have been receiving the following message more and more frequently for about 1 week:

"host ***** refused to talk to me: 501 Syntax error in parameters or arguments"

The message does not only come from a recipient/host. Other senders can then successfully deliver to this recipient/host.

In the last report, we have now found out that it was sent by a sophos node that is on a blacklist. but then should the error message look different?

 

best regards

Tolik



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  • 0

    I have the same issue and believe that through transport some mail header fields are being shiftet. I had a support case open but that did not lead to any solution as they just blamed the recipient server to cut the connection.

    Also the subject line "date:subject:to:from;" shows that there is something messed up with the header fields.

    Did anyone find a solution to this?

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  • 0

    I have the same issue and believe that through transport some mail header fields are being shiftet. I had a support case open but that did not lead to any solution as they just blamed the recipient server to cut the connection.

    Also the subject line "date:subject:to:from;" shows that there is something messed up with the header fields.

    Did anyone find a solution to this?

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