I've been unable to send or receive emails as I'm getting a message that the SMTP connection to the server has failed. I may have changed something on my Mac by mistake, as it's a long-standing email account ( Virgin) and there are no other interconnectivity issues. Any advice?
Please read Writing an effective Apple Support Commun… - Apple Community and then re-write your post with some useful information. We are pretty good however we have no idea what version of Mac OS is installed, the model year iMac you have or what troubleshooting you have attempted already and we laid off all of our mind readers when they did not renew their mind reading licenses.
Try deleting the account and re-adding?
Failing email / SMTP connection
