Error msmtp: server message: 552 5.3.4 Error: message file too big;?

Question

Mail server

Good day dear experts. I ask for your help because the brain is already boiling.
We use VMBitrix at work with centos 7 on board. Version 7.4.1 is the latest. After the update, a problem appeared - Bitrix mail stopped accepting letters with attachments larger than 14 MB.
The search engines did not give anything, except that the error says that the file is too large.
MSMPT settings as such do not exist - only a file with mailbox authorization settings.
A search in the code of the Bitrix itself has not yet brought results.
Now the question itself is how to make Bitrix accept and process letters in the mail with a volume of more than 14 MB and not fall into the error given in the title of the question? For before update 7.4.1 everything worked just fine.