I'm NOT talking about domain.com and subdomains subdomain1.domain.com, subdomain2.domain.com matching only domain.com in excl. sender.
I need to ask a what-would-be-if question.
The situation is this:
Facebook sends notifications from facebookmail.com, but a clever system was implemented that uses 5-10 letter string (hash key) assigned to each user in the senders addr. If a spammer finds out I'm on facebook and knows my e-mail, then I will be able to filter non-spam coming from the domain by the hash key.
I would just add in the whitelist that the right part of senders e-mail is "+MY_HASH@facebookmail.com", but how to emulate this in excl. sndr?
First, I had exclusive sender set to facebookmail.com.
Every mail was forwarded and there was no spam sent.
I didn't come to be spamed on the spamgourmet addr, but I wanted to try using this feature Facebook uses, so instead I
set the exclusive sender to +MY_HASH@facebookmail.com.
It produced the same result because I wasn't getting any other mail from that domain but with that hash key.
So, my question is:
Does +MY_HASH@facebookmail.com in excl. sender mean:
anything+MY_HASH@facebookmail.com
OR
anything@facebookmail.com
OR
anything ---because "@" alone means unconditional match, if I understood corectly
Sorry to bother you. I did find a topic about regexp, but I am a n00b in regular expressions, so I require help.
Thanks for answers.