We noticed an issue occurring whenever a customer of ours tries to send an email when we have Cloudflare running.
The customer cannot send any emails out if their email has a picture/signature in it. They simply get a timeout. This primarily affects them when they try to send through webmail. We did not have this issue before Cloudflare.
NOTE: They can still send regular text emails just not emails with signatures in them.
Has anyone else ever noticed this and/or has a fix for it?