email client complaining about IMAP alert (max atom size too small)

noimad1

Well-Known Member
Mar 27, 2003
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Has anyone ever had a complaint, or seen this:

I have a client that is getting flooded with messages that say:

"Your IMAP server wants to alert you tot he following: Fatal error: max atom size too small: File exists"

I can not for the life of me figure out what is causing this....?
 

cPanelMichael

Administrator
Staff member
Apr 11, 2011
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Hello :)

Which specific email client is in-use when this message occurs? Is it happening on alternate email clients, or is it isolated to a single email client on a specific email account?

Thank you.
 

noimad1

Well-Known Member
Mar 27, 2003
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It looks like he is using outlook 2013. I'll see if he can try another client as well. I was thinking it was a message directly from the imap server based on the wording of the error, but do you think it could be client specific?
 

cPanelMichael

Administrator
Staff member
Apr 11, 2011
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The message likely stems from Courier. How many emails are in this particular inbox?

Thank you.
 

noimad1

Well-Known Member
Mar 27, 2003
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it's a very large mailbox. The inbox has 60k+ e-mails. Some sub-folders have more.
 

cPanelMichael

Administrator
Staff member
Apr 11, 2011
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You may want to consider switching to Dovecot if you have not done so already. It may handle this many emails a little better than Courier. Also, what type of file system (e.g. ext3) is in use?

Thank you.
 

noimad1

Well-Known Member
Mar 27, 2003
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I didn't realize we were still running courier on that server. I think switching to Dovecot has worked so far.