Max Message Size

Problem reported by Carlos Sosa - 7/15/2020 at 6:41 PM

Submitted

Hello.

Lately some of my users have reported that they are getting a bounce back do to message exceeding message size limit. Here is the message on the bounce back

Failed Recipient: ***@gmail.com
Reason: Remote host said: 552 Message size of '20754064' exceeds max message size of '10485760'

Its weird because another user got the same bounce back (With the same message size limit of exactly: 10485760) and the recipient was different and the domain also different. I believe GMAIL's limit is 50MB or at least 25MB.

The bounce back seems to be local from (System Administrator) there is no from address it only says System Adminitrator so this seems to be local.

I checked the option in Settings - Protocols - SMTP-In - Max Message Size And it is set to 50 (I'm guessing is 50MB)

I'm running Smartermail Version: 16.3.6989

I'm also running Declude, just in case.

Any help would be greatly appreciated.

Regards.

Carlos Sosa

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Sébastien Riccio Replied

7/15/2020 at 10:42 PM

Hello,

The bounce message seems to indicate that it's the remote server refusing the message because of its size:

Failed Recipient: ***@gmail.com
Reason: Remote host said: 552 Message size of '20754064' exceeds max message size of '10485760'

Do you an outbound gateway ?

Kind regards

Sébastien Riccio System & Network Admin https://swisscenter.com

Carlos Sosa Replied

7/16/2020 at 4:29 AM

Hello Sebastien.

Yes I'm using AWS SES for outbound gateway and apparently they have the 10MB Message limit..

Thanks for the reply. I'm now looking at other options for outbound gateway. Any recommendations?

Regards

Carlos Sosa

John Marx Replied

7/16/2020 at 1:31 PM

You can contact AWS and request a larger size. We did as we use them as one of our gateways.

Carlos Sosa Replied

7/17/2020 at 3:36 AM

Hi John

Thanks for the Reply

We have contacted AWS about the "Attachment Size limit in AWS SES" And they said the 10MB Limit is hard coded and cannot be changed (applies to all customer equally)..

They were able to increase the sending limit (The number of messages we are allow to send) and the send/rate but not the Attachment Limit Size.

Are you sure AWS was able to increase the Attachment Size in your case?

Regards.

Carlos.

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