Confirm the error is from Office365 when delivering the message or from LISTSERV when submitting the message. 

Sounds like your list header is configured for a maximum message size of 9MB, a bit small. 

Select your list, then go to List Management -> List Configuration -> List Configuration Tasks. Select the Attachments tab and look at Sizelim=. This keyword also appears in the list header.

matthew black
california state university, long beach


-----Original Message-----
From: LISTSERV List Owners' Forum [mailto:[log in to unmask]] On Behalf Of F J Kelley
Sent: Tuesday, May 12, 2015 1:24 PM
To: [log in to unmask]
Subject: message size

I have asked this before, but wanted to check.  A user is receiving this; I don't like huge messages going out, but am sure to be told that "it did not used to be this way".  Actually, since the mail service on campus is MS Office 365, I'd say it was them, but the error ids our list server.  What is the typical max you are allowing?  --Joe

Your message wasn't delivered to anyone because it's too large. The limit is 9 MB. Your message is 18 MB.

Your message is larger than the size limit for messages. Please make it smaller and try sending it again.

listserv.cc.uga.edu gave this error:
SMTPSEND.OverAdvertisedSize; message size exceeds fixed maximum size 

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