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Do these two checks before you contact anyone, so you know what to ask for. Both are free and need no software. You need two things: your domain name, and any Gmail address. Your domain name is the part of your shop email after the @. In service@example.com, the domain is example.com.
Educational guidance. Email security is not part of the TireTutor product, and TireTutor does not manage your mailboxes. These pages explain how it works so you can brief the right person.

Check 1, read the grade on a message you send

Gmail grades every message it receives. Send yourself one. Read the grade.
1

Open your shop email

Use the account that ends in your own domain.
2

Send a short message to any Gmail address

A personal Gmail account works. Put anything in the subject.
3

Open that message in Gmail

4

Select More beside Reply

More is the three-dot menu at the top right of the message.
5

Choose Show original

A new tab opens with the message details.
6

Find the SPF, DKIM, and DMARC results

They sit near the top, above the message text.
7

Search the page for spf, dkim, and dmarc

The header is long. Press Cmd+F, or Ctrl+F on Windows.
Each of the three shows a result. The word you want is pass.
A domain with all three records working holds header text like this:

What your result means

A missing line is the most common result for a shop. It means nobody ever set that record up. Nothing warns you.

Check 2, look up the records themselves

Check 1 grades one message. Check 2 reads the records, so you can see exactly which one is absent. Google runs a free checker. It needs no account.
1

Open Google Admin Toolbox Check MX

2

Type your domain into Domain name

3

Type your selector into DKIM selector (optional)

Take the selector for your email provider from the table below.
4

Select Run checks

Unsure which provider runs your mail? The check reports your mail servers. Names ending in google.com mean Google Workspace. Names ending in outlook.com mean Microsoft 365.

Write down three answers

Take these three answers to whoever manages your domain. They cannot start without them. The third answer is the one shops rarely have. The setup page explains how to find it.

Where to go next

Overview

What these records protect, and what goes wrong without them.

Getting the records set up

Find who manages your domain, and what to ask them for.