Issue allowed characters for email address

[moswak]

Centos 7.9
Plesk Obsidian 18.0.33

a long time ago the customer set up an email distribution list based on forwarding.
He added a plus sign to the email address.
for example test+@domain.tld

that has worked normally for the last few years. an interim transfer to another server with the plesk migrator also worked.
suddenly he can no longer edit his forwarding because plesk says that test+@domain.tld is not a valid email address.

1. why was the + sign subsequently banned in the email address?
2. How can the customer now edit his forwarding "without" renaming the email address of his mailing list?

 

[moswak]

sorry - please move this post from -Plesk Onyx for Linux to -Plesk Obsidian for Linux

 

[syazov]

Hi, moswak
`+` character was banned in the scope of support of mail subaddressing (VERP-style) in 18.0.30 because it is usually used as a delimiter between local part of mailname and tag.

 

[zip404]

were you able to solve this problem? how?

 

[moswak]

I don't know of any solution. the customer has to change his email address for his distribution.