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Not reliable at all and will fail for a HUGE % of legit email.
Expecting the server sending mail for a domain to also be configured to receive email for the domain is an assumption thats very likely to be incorrectly.
Checkout (see the full information about pricing) The table in Checkout section clearly summarizes prices that are associated with options you choose in the tool's form.
Your credit balance is displayed on the right side above the main menu.
If more servers have the same value set, the client should randomly determine their order.
The TTL value specifies how long the MX record stays valid.
Also, your name server records on the TLD servers (.com, .org, .net, etc) generally have a higher TTL and thus their cache gets cleared later than you’d expect.
This is pretty much all I can say, since you didn’t give us anything we can test with like the domain name.
Every single server in the world have their MX record exposed to the world?I just changed my hosting from Go Daddy to Digital Ocean and we are not receiving mails.