The site stopped sending mail, how to fix it?

Question

Mail server

Hello!
The site stopped sending mail, Laravel is there and sent about 50-80 email messages per day. All messages are different and necessary - notifications from CRM.
And now the mail stopped coming to everyone at once.
Could the server somehow be marked as spam and banned? Where to dig?

Answer 1

1. Make sure that the mail is sent from the server, to do this, make sure that the MTA is up, there are records in the logs that the mail has left.
2. Send a test letter from your MTA to yourself...to different mailboxes
,
3-4 got nowhere, hire a specialist

Answer 2

https://mxtoolbox.com/blacklists.aspx

Answer 3

If the mail leaves (and you didn’t break something there with your update), then write / call / go to the hoster.