emailrelay
nounUK /ˈiːmeɪl ˌriːleɪ/
US /ˈiːmeɪl ˌriːleɪ/
A computer that passes email messages along to the right place.
The emailrelay sent my message to my friend's inbox.
OTHER MEANINGS
2. The act of forwarding an email from one system to another.
The emailrelay happened automatically overnight.
3. A service that resends emails on behalf of another sender.
Our company uses an emailrelay to send newsletters.
4. A setting in an email program that tells it which server to use for sending.
Check the emailrelay setting if your messages won't send.