Am Mittwoch, den 05.12.2018, 22:31 +0000 schrieb Jochen Bern: > On 12/05/2018 06:57 PM, admin (@awib.it) wrote: > > I have a group alias (a...@company.com). > > (1) Only company.com accounts should be able to send an email to > > everybody in that company via a...@company.com. > > Do you have a means to identify "some suitable account was used" - as > opposed to a trivially forged sender address - *other* than by > watching > the actual MUA-to-MSA login happen?
Either way would suffice - the simpler the better. Restricting the sender to be on the same domain if mail is sent to the company group alias would be fine. All I try to achieve is to protect those in the group from unwanted "SPAM", so no one from outside the domain should be able to send to that alias (a...@company.com is quite generic...). Optionally only chosen senders (whitelist) should be able to send to that alias. We do not want our mail system to become a craigslist or everbody being able to reach thousdands of people with only one email being sent. We are rather generous thinking of mail attachments (up to 100MB). I do not want to see an email like this copied over to thousands of accounts... > [...] > > Regards, Thanks four your thoughts! -M
