I'm an employee at a university. I've been having my emails automatically forwarded to my Gmail account. I've also been using Gmail's smtp server for over 4 years to "send mails as" my university account. This has worked just fine, until yesterday.
Emails are still forwarded from my university account to my Gmail, but none of my sent mails are going through at all. There are no error messages. I only discovered this when some of my colleagues told me they weren't receiving my messages. It's been over 24 hours.
The settings for "send mail as" on my gmail account are:
Mail is sent through: smtp.myuniversity.org Secured connection on port 465 using SSL