On Sat, 9 Apr 2022, John Levine wrote:
PS: Gmail allows general plus addresses, Yahoo allows a limited number, can't think of any other significant commercial mail system that allows either.
Apart from whether they are significant I've found many others provide plus addressing / subaddresses, though if they are Qmail based generally they use a dash rather than a plus.
Microsoft's Exchange Online, Office365, and Microsoft365 can allow it generally as well. Whether a + means plus addressing or is just another character is a per tenant setting with plus addressing as the default for new tenants but for existing tenants it depends on their existing addresses (if none have a + then plus is enabled else disabled). I don't know if this applies to Hotmail/Live/Outlook. <https://docs.microsoft.com/exchange/recipients-in-exchange-online/plus-addressing-in-exchange-online>
Fastmail was mentioned earlier, and they go beyond it using subdomains, i.e., mail...@example.com is the same as mailbox+anyth...@example.com as well as anyth...@mailbox.example.com provided you've got the DNS setup. <https://www.fastmail.help/hc/articles/360060591053-Plus-addressing-and-subdomain-addressing>
Gmail also goes beyond it, in that they also ignore periods such that mailbox@, mail.box@, mailbo.x@, mailbox.@, etc., are all the same mailbox. <https://support.google.com/mail/answer/7436150>
Yahoo has "disposable" addresses that use a dash (quite expectable since they use qmail-ish), which are not automatic, you have to create them -- 500 are allowed -- and they are limited generally to Plus subscribers. <https://help.yahoo.com/kb/SLN28815.html>
Verizon (nee Yahoo) Small Business does not appear to though at one time they were all hosted on the same platform as the Yahoo! (et al) brand (and might still be) so they might provide either plus or disposable.
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