Why are my outgoing emails being blocked when using NORD VPN?

[Mike_MASS]

The header says it all. I can't even send an email to my daughter across town unless I disable my VPN. 

[BruceW]

Using a VPN to send mail will always be chancey. The best of them are sometimes used to distribute spam and other forms of abuse, which results in the VPN's IPs being blocked for sending mail.