Lately I've been getting Mail sending error when sending larger files ie short video attachments,Pdf files.
Text files Transmit quickly.
It seems to hang when gets up 99% when sending email message. I have one email stalled at 53% (progress status)
A few tries sending the email it will eventually will be sent.
I have no downloading issues
Virus Checker - Trend Micro
Router - netgear
Server - MTS
Firewalls - turned off
" Sending of Message Failed
Message could not be sent because connecting to SMTP server smtp.mts.net failed. The server may be unavailable
or is refusing SMTP connections. Please verify that your SMTP server setting is correct and try again, or else contact your network administrator."