Delivering and receiving Emails in the modern internet is such a shit show. The big providers (looking at you, Google and Microsoft!) do their own shit, and the old protocols are at least inofficially deprecated. Just try to send a mail via SMTP using an Office365 account (e.g. because the customer uses Office365 for their mail). The admin has to manually enable SMTP for users, and then you have to implement shit like XOAUTH2. Sigh.
Delivering and receiving Emails in the modern internet is such a shit show. The big providers (looking at you, Google and Microsoft!) do their own shit, and the old protocols are at least inofficially deprecated. Just try to send a mail via SMTP using an Office365 account (e.g. because the customer uses Office365 for their mail). The admin has to manually enable SMTP for users, and then you have to implement shit like XOAUTH2. Sigh.