Are you unable to send and receive emails? Find out if this issue is cause by a firewall or anti-virus, and how to fix it.
It could be that you have set up a firewall or anti-virus on the device that you are sending your emails from, which could be preventing you from sending and receiving emails.
Within your anti-virus software you should add an “allow” rule for your SMTP server setting which is smtp.123-reg.co.uk and possibly the IP address for the server which is ‘126.96.36.199.’
If you are still experiencing problems, take a look at your anti-virus software support guide for more information. Don’t forget to also check our support article for more useful information: https://www.123-reg.co.uk/support/answers/Video/Email/having-trouble-sending-and-receiving-emails-4110/
Publisher: 123 Reg
You can watch this video also at the source.