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A comment on Everyone Wants Your Email Address. Think Twice Before Sharing It. Parent comment

Re:Everyone Wants Your Email Address. Think Twice Before Sha... by leshokunin on Monday February 19, 2024 @12:49AM (#39426583)
How do you set your domain on fast mail to use @.domain.com? I only know @.
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Re:Everyone Wants Your Email Address. Think Twice Before Sha... by WirelessGigabit on Monday February 19, 2024 @02:21AM (#39426994)
(I'm using wrong terminology) It works because if there is no entry for *.domain.com the system will go one level up, to domain.com for the MX records.

It even works multi-level, like x.y.domain.com will use the MX records of domain.com (provided there are none for x & y).

This is worth mentioning as x.y.domain.com does not work if you have a *.domain.com SSL certificate.

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Re:Everyone Wants Your Email Address. Think Twice Before Sha... by leshokunin on Monday February 19, 2024 @06:43AM (#39428732)
Really? Cool. Would you be comfortable sharing your dns settings and or fastmail domain settings? Cool if no but I wanna give this a go!
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Re:Everyone Wants Your Email Address. Think Twice Before Sha... by WirelessGigabit on Monday February 19, 2024 @11:01AM (#39431213)
I don't use fastmail. I use Office365.

It seems that fastmail only does *.domain.com and not *.*.domain.com: https://www.fastmail.help/hc/en-us/articles/360060591053-Plu...

Hope that helps

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