Gmail's intermediate SSL certificate for the Simple Mail Transfer Protocol (SMTP) appears to have expired, causing issues for new users trying to send email via Gmail or Google Apps with the standard.

I'm writing a program that will have to send mail through SMTP. Doing that, I came across a really weid behavior of our exchange 2013 server: If the SMTP session authenticates the session through AUTH ...

In this post, we will talk about how to fix Outlook Error 0x800CCC67. It is an SMTP protocol error that prevents users from sending email messages. SMTP stands for ...

Sorry it took me a few days to respond. The GPO looks good, everything there has not changed. Our firewall is not blocking traffic on the SMTP ports. Is there a way to check the exchange files for ...

Some Outlook users have reported that they are unable to send email from the app as when doing the same, they receive Error 503 stating that the Valid RCPT command ...