Can a business email address contain a backtick?

For a public-facing small business, prefer a simple role address that avoids backticks, such as bookings@<short-name>.au, quotes@<short-name>.au, or sales@<short-name>.au, then test the exact setup before printing or publishing it.

Why a backtick is a poor public choice

RFC 5321 section 4.1.2 defines the usual SMTP mailbox local part with the atext character set. The backtick (grave accent) is not an ordinary atext character. It typically appears only when the local part is written as a quoted string so special characters can be carried inside quotes. That is different from inserting a bare backtick into an unquoted local part, which is not a valid unquoted address.

Mail providers rarely create or recommend public business addresses that rely on backticks. Website forms, booking tools, CRMs, accounting packages and imported contact lists often reject or strip the character, treating it as markdown, shell syntax, a typing error, or an invalid character rather than part of a legitimate mailbox.

When customers see a backtick in an address, they typically omit it, replace it with a period, apostrophe or hyphen, or ask the business to confirm the real mailbox. The same workflow concerns that make spaces, quotation marks and giving an email address over the phone hard are amplified when a backtick is part of what customers must reproduce.

Hard to name, hard to find on a keyboard

Most everyday addresses people recognise are unquoted local parts made of letters, digits, and a few common separators such as a period or hyphen. A backtick sits outside that familiar set.

Picture a business telling a customer an address that puts a backtick between two words in the local part. The customer hears "sales backtick desk", "sales grave accent desk", "sales weird quote desk", or simply "sales desk at ..." and writes down something that no longer matches the real mailbox. On a phone call, people often skip the character entirely because they do not know what to call it.

On many mobile keyboards the backtick is buried behind a symbols layer, and on some layouts it shares a key with the tilde. Customers may type a single quote, a double quote, or nothing at all. That variability does not mean every customer will mistype the address. It means a backtick introduces an interpretation choice where none would exist if the address were sales@<short-name>.au, desk@<short-name>.au, or bookings@<short-name>.au instead.

Confusion with markdown, code and curly quotes

One persistent source of confusion is that backticks already mean something else in everyday digital writing. People who use chat tools, documentation or developer notes are used to seeing backticks as markdown formatting around code. When a public contact line shows a backtick inside the mailbox, staff and customers may treat it as leftover formatting rather than a character they must type.

In print and on screens, a backtick can also look like a straight quote, an apostrophe, or a missing mark, especially at small sizes on a business card or van sign. Related punctuation such as quotation marks, commas and spaces creates similar display-name and typing confusion, which is why a plain role mailbox is safer for cards, vans and website footers.

That mental model makes backtick addresses feel accidental. A customer who cannot see or name the mark will contact the business to ask for the "real" email, or will guess a simpler version and never reach the intended inbox.

Form validation and CRM stripping

Even where a quoted-string form that includes a backtick can be valid in the RFCs, many email validation libraries and form tools reject or flag the character because it is uncommon in everyday public addresses and appears often in code snippets, markdown and shell examples. Form validators often implement stricter rules than the RFC minimum.

Website contact forms, CRM imports, booking systems, accounting packages and quote generators may treat a backtick as an invalid character, a typing error or a security concern. An address that includes one may be rejected with "Invalid email address", stripped of the backtick, flagged for manual review, or accepted and later rejected by a downstream system.

The business may not see the alteration until a reply to a stored address bounces or goes missing. A customer who enters a backtick address into a website form may receive no confirmation, an error asking them to re-enter the address, or a stored mailbox that no longer matches the printed card.

Contact lists and automated systems that validate email addresses often reject or quarantine addresses containing backticks because they are rare in everyday business mailboxes and are sometimes associated with pasted code fragments. Even when a system accepts the address initially, later integrations may strip or rewrite it.

Print and signage

When printed on a business card, invoice, quote PDF, van sign or website footer, a backtick in the email address creates visual confusion because it looks like optional decoration, a mistyped quote or leftover formatting rather than a character the customer must type. At small print sizes it is easy to miss or to confuse with similar marks.

The same address that is flagged or rejected in a web form becomes even more problematic when printed on physical materials. A customer looking at a backtick address on a business card, invoice header or van sign may:

Treat the backtick as optional and omit it when typing.

Replace it with an apostrophe, a straight quote, a period or a hyphen.

Type the word "backtick" or "grave" literally into the local part.

Assume the mark is a printing error and contact the business to confirm the real mailbox.

Skip the character because they cannot find a backtick quickly on a mobile keyboard.

The risk is not that every customer will make one of these errors. It is that a backtick introduces multiple plausible interpretations where a simpler address like sales@<short-name>.au or bookings@<short-name>.au would be unambiguous.

Safer alternatives for public-facing business addresses

For a public-facing small business, the simplest and most reliable approach is to choose a role or person address that avoids backticks entirely. Addresses like quotes@<short-name>.au, bookings@<short-name>.au, sales@<short-name>.au, or info@<short-name>.au work across forms, CRMs, email clients, printed materials and phone dictation without introducing naming confusion, keyboard-hunting delays or markdown-style friction.

If the business currently uses a longer address and is considering a shorter matched .au address as an alternative, the key advantage is that shorter addresses are easier to say, print, type and remember, without requiring special characters that customers struggle to name, find on a keyboard or trust in print. A shorter .au address can forward to the existing inbox (subject to setup and approval), so the business does not need to abandon the existing address or change the website immediately. An account manager confirms fit, availability, .au eligibility requirements, setup steps and provider compatibility manually before anything changes.

How to test before you publish

Before printing a business email address on cards, invoices, quotes, van signs or website footers, test the exact address through the full workflow:

Send a test email from a personal account (Gmail, Outlook, etc.) to the address and confirm that the email arrives in the intended inbox within a few minutes.

Enter the address into the business website contact form (if one exists) and confirm that the form accepts the address, sends a confirmation, and that the confirmation arrives at the intended inbox.

Import the address into a CRM or contact list (such as HubSpot, Salesforce, Mailchimp, or a spreadsheet) and confirm that the address is stored correctly without being rejected, stripped or altered.

Create a test invoice or quote PDF containing the address and ask a colleague or friend (who was not involved in choosing the address) to type the address into their email client from the printed or on-screen PDF. Confirm that they type it correctly without assistance.

Dictate the address over the phone to a colleague or friend and ask them to write it down and type it into their email client. Confirm that they can do so without requiring spelling assistance, clarification or corrections. Pay particular attention to whether they know what to call a backtick, and whether they omit the mark because it sounds optional.

If any step reveals that the address is rejected, altered, mistyped or misunderstood, adjust the address before printing or publishing it. Testing the exact workflow before committing to printed materials or public listings prevents costly reprints, customer confusion and missed communications.