We have an Exchange 2010 server and we do not have any limits on sending and receiving for our users. We can typically receive email attachments up to 30 MB or so.
A user was informed by a client that an email attachment that was 25 MB was giving a 552 5.3.4 Message size exceeds fixed maximum message size> #SMTP# message.
Why would this intermittently happen as this user has since been able to receive emails higher than 25 MB? Any assistance offered would be greatly appreciated.