Is there any maximum attachment size?

MailChannels doesn't set the maximum message size as we only broker those emails between the sender and receiver while performing analysis, spam content scanning, IP RBL checks, reputation leveraging and other methods for cleaning the spam after it leaves your network and before it reaches the intended destination. 

We generally don't see email attachments larger than ~=15MB as many receivers used to block at this level and wouldn't accept anything larger to avoid becoming a cheap/free file server.  so we wont allow attachment bigger than 100MB.
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