edo42

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Sending with SMTP from another mail account works fine with any attachment size.

in Email with attachments >5MB blocked by ZyWall USG 20 Comment by edo42 February 2019
Mail is sent to an IMAP server using SSL on port 587. Smaller files send ok, regardless of the type of file. I don't have a UTM Profile section, seen online what you're talking about. I only have a Anti-X section that contains ADP, Content Filter, Anti-Spam and DNS Inspection. Every option in those sections is disabled.

in Email with attachments >5MB blocked by ZyWall USG 20 Comment by edo42 February 2019
Small attachments go through fine. Attaching a 7MB PDF file does not work for example. It seems like the mail client starts sending the content and then the connection just times out after a minute or so. Removing the zyxel and connecting directly results in the mail getting sent fine in the matter of a few seconds.

in Email with attachments >5MB blocked by ZyWall USG 20 Comment by edo42 February 2019
Wrote you a PM. Problem is still there.

in Email with attachments >5MB blocked by ZyWall USG 20 Comment by edo42 February 2019