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I installed/configured at my Ubuntu 14.04 LTS server the mailserver with Postfix and Dovecot.

I tried via Roundcube-webmail to send an email with an attachment (size 12mb). But when I click at the send button, I get the message:

SMTP-error: Message size exceeds server limit

How and where can I set this message-size-server-limit?

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I found the answer:

Add/set message_size_limit in main.cf:

message_size_limit = 104857600

and restart Postfix.

I had to ADD it, because this line wasn't in main.cf

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