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If your quotes, invoices, and replies land in spam folders, you lose work without ever knowing it happened. I author and publish the authentication records your domain is missing, tighten them on a staged schedule, and then monitor them daily.
Any business that sends email from its own domain, which is every business. Especially urgent if customers say they never got your email, if replies dry up after you send quotes, or if you have never heard the words SPF, DKIM, or DMARC, because then your domain is almost certainly both underdelivering and spoofable.
The three records that tell receiving mail servers your email is really yours: SPF listing who may send for your domain, DKIM signing each message, and DMARC telling receivers what to do with mail that fails. I also close the quiet hole most businesses leave open: any domain you own that should never send mail gets locked down so nobody can send as it. A blacklist and reputation check rounds out the setup, because publishing perfect records on a burned domain fixes nothing.
DMARC set to enforcement on day one can destroy your own legitimate mail, because most businesses have forgotten senders: an invoicing tool, a booking system, a newsletter service. The rollout goes in stages, from monitoring to quarantine to full rejection, with the reports reviewed at each step so every legitimate sender is authenticated before the rules tighten. It takes six to eight weeks to do safely, and doing it faster than that is how vendors break their clients' email.
Records rot: a provider changes IPs, a well-meaning edit breaks a record, a registration lapses. For $75/month, the same instrumentation that watches my own domains checks yours daily and raises an alarm when something breaks, instead of you finding out weeks later through silence. Included in the Managed care tier.