A problem with the records can affect mail delivery to your domain.A common MX record error that can affect the delivery of your email is the entry in the Name, Host, or Alias column.Priority values don't have to be exactly like those shown in the table. If your host uses some other method for assigning priority, follow that method to designate ASPMX.

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Prior to Postfix 2.6, the response is hard-coded as "450".

The Postfix configuration file specifies a very small subset of all the parameters that control the operation of the Postfix mail system.

Unnecessary changes are likely to impair the operation of the mail system.

The numerical Postfix SMTP server response code for an access(5) map "defer" action, including "defer_if_permit" or "defer_if_reject".

Convert Plug has necessary validations set for all the fields, especially the email field.

But, another kind of validation one can set is the MX Record Validation. MX Record Validation checks whether the email address entered by a user is valid or fake.

The "" is required for "value1", optional for "value2".

This form is supported with Postfix versions ≥ 3.0.

Mail is delivered to the server with the highest priority first. If your host allows only one MX record or doesn't allow ranking, enter ASPMX.