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One sender (@gmx.net) to my mailserver received an error message:

Message size exceeds capabilities of MX responsible for the recipient

I increased the message_size_limit from 10240000 to 20480000, but I'm not sure that this will help as I thought the error message relevant to the message_size_limit should be Message size exceeds fixed limit instead. I never heard about that capabilities of the MX.

Q: What does the error mean ? How to "fix" ?

A Google search was of no help:

I use tomav/docker-mailserver.

(Maybe) relevant configuration:

mailbox_size_limit = 0
virtual_mailbox_limit = 51200000
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1 Answer 1

Reset to default
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I could imagine that the free space of the partition of the postfix queue is not enough. I can still remember times when Docker only provided 10GB for the container partition. Depending on which configuration you are using, this could be a problem. Alternatively, mailbox_size_limit or virtual_mailbox_limit should be increased.

What exactly does postconf message_size_limit say?

For an exact answer, more information would be necessary, since I don't know the container, I can't go into it further.

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