If they start taking those bills, they will want to get them often.
Self hosting is a lost cause for e-mail unfortunately. You either get overrun by the amount of creatively formatted spam, or all of your e-mails are dropped despite having perfect SPF+DKIM+DMARC records and long-time owned domains.
Especially Microsoft has a horrible record of dropping e-mails everyone but big enough companies. Guess which software is the most popular choice in business e-mails: Microsoft Exhange. So no job applications, no communication with the various government offices, no business enquiries but loads and loads of spam that uses all possible codepoints in UTF.
In one sense, I could kind of understand it. If they can eliminate 99% of all spam by only accepting mail from a handful of domains, and if those few domains happen to be what 99% of their users get (wanted) email from, it's hard to justify the expense and hassle of accepting mail from anyone else. That said, considering how much spam is sent from gmail and other large mail providers it seems like the actual numbers probably aren't as supportive.
I don't agree with it, but I could understand it. Because of the spam/blackist problem, every ISP I've worked for has ultimately either stopped providing email service or outsourced it.
Self hosting is a lost cause for e-mail unfortunately. You either get overrun by the amount of creatively formatted spam, or all of your e-mails are dropped despite having perfect SPF+DKIM+DMARC records and long-time owned domains.
Especially Microsoft has a horrible record of dropping e-mails everyone but big enough companies. Guess which software is the most popular choice in business e-mails: Microsoft Exhange. So no job applications, no communication with the various government offices, no business enquiries but loads and loads of spam that uses all possible codepoints in UTF.