

Ubuntu has a diversity policy to explicitly welcome and encourage participation, mentioning that they explicitly honor diversity in sexual orientation among other things. It does not explicitly mention queerness.
A moderator made a bad a call. It sounds like there may have been some confusion about the word queer used as a slur vs a self-identification.
Lol. After professionally hosting email for 15 years I’m happy to let someone else handle it now.
About 90% of incoming mail will be spam and it will be your job to make sure you are doing good job of classifying it so you don’t get junk in your inbox and don’t lose real mail in the spam folder.
Then for outgoing mail you need to make sure SPF, DKIM and DMARC are all in order.
Then there is all the usual stuff of security updates, backups, monitoring, alerting, logging and having a plan for internet outages.
Yes, it’s all doable but I won’t expect it be “set and forget”. I expect there will be quite a bit of tuning with some possible spam and delivery problems while you get kinks worked out.