Am 04.07.25 um 15:09 schrieb Mike Hammett via mailop:
I'm aware of (but have not looked THAT deep into) EasyDMARC, MX Toolbox, and
Hetrix. I'm looking for a service that I could use for MSP customers that not
only monitors, but also tests the deliverability of my client's mail. I don't
mean marketing campaigns, but primarily normal business communications.
The one true test whether your client can send e-mails to their partners is by sending an e-mail through exactly the
same channel that your client would use for e-mail that they want to send anyway. As the minimum, that means "do just
send the mails that are agreed upon in the business relationship, and do proper SMTP reject and bounce handling".
*It also means that no external service can really do the job for you.*
The rest is etiquette, and not simply a technical solution:
At the beginning of the business relationship, send a welcome message. It should clearly communicate the reason for
contact, and an easy way for misaddressed recipients to say "I'm not the right person". If the contact is initiated by
the partner via a web form, you can check whether the domain has an MX or A record at form submit time so that you can
at least catch some egregious typos. This isn't failsafe, though, as there are quite a number of typo-squatting domains
for common e-mail service domains.
If there is a valid requirement that your client needs to know ahead of actual sending time that their mail will likely
be delivered (for example, to use a different communication channel for time critical communication such as invitations
or invoices), one could try to get their partner to agree to some recurring "reminder" mail (such as the monthly mail
sent out by some mailing list managers) or to a kind of pre-notification that informs them of an impending mail
transaction. If your client's partner does not agree to such a format, you're back to start, and just do SMTP reject and
bounce handling.
Cheers,
Hans-Martin
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