3 commits

Author	SHA1	Message	Date
Winni Neessen	8d86c3d8b2	Better test coverage for senderror.go	2023-01-02 21:55:37 +01:00
Winni Neessen	43efd6b3a8	Add missing REUSE header in senderror_test.go	2023-01-01 14:25:44 +01:00
Winni Neessen	78df991399	Proposal change for #90 ... Did a complete overhaul of the senderror.go. - the list of `errors.New()` has been replaced with constant itoa error reasons as `SendErrReason`. Instead, the `Error()` method now reports the corresponding error message based on the reason. - The `SendError` received a `Is()` method so that we can use `errors.Is()` for very specific error checking. I.e. we can check for `&SendErrors{Reason: ErrSMTPMailFrom, isTemp: true}`. This provides much more flexibility in the error checking capabilities - A `isTemp` field has been added to the `SendError` type, indicating whether the received error is temporary and can be retried or not. Accordingly, the `*Msg` now has a `SendErrorIsTemp()` method indicating the same. The decision is based on the first 3 characters returned from the SMTP server. If the error code is within the 4xx range, the error is seen as temporary - A test for the SendError type has been added	2023-01-01 14:20:13 +01:00