Can you have an email address in a domain with Polish characters?
Author: Domeny.ForSale editorial team Published Updated
In brief: Yes, the part of an address after the @ sign can contain Polish characters, for example biuro@żółw.pl, provided the IDN domain has been registered and the email provider supports it. However, this does not mean full compatibility with all forms, applications and email systems. The safest approach is to use such an address alongside an alias consisting only of ASCII characters.
What is a domain with Polish characters?
An IDN (Internationalized Domain Name) is an internet name containing characters outside the basic Latin alphabet, such as ą, ę, ł, ń, ó, ś, ź and ż. This allows users to see and type the name in its natural form, for example żółw.pl.
However, the DNS system, which directs traffic to the website and mail server, does not use this form directly. The domain is converted into a technical ASCII representation known as Punycode. This representation usually begins with xn--, and the conversion is performed by the browser, email application or service provider’s system.
Registering an IDN domain does not, by itself, create a mailbox. The domain needs the appropriate DNS configuration, including MX records pointing to the servers that receive email, and the chosen provider must allow it to be added to the service. You should check the availability of specific characters and email support with the registrar and hosting provider.
Polish characters before and after the @ sign are two different matters
In the address biuro@żółw.pl, the Polish characters appear in the domain, after @. This is a case handled by the IDN mechanism. If an email client cannot handle the Unicode representation, it is sometimes possible to enter the technical Punycode version of the domain, although it is difficult to remember and not well suited to marketing materials.
An address such as księgowość@firma.pl, where a character with a diacritic appears before @, is a different matter. Internationalized addresses of this kind require support for EAI standards, including the SMTPUTF8 extension, throughout all relevant parts of the message’s route. Not every form, email provider, CRM system or recipient’s server accepts them.
In practice, it is better to keep the local part of the address in the basic alphabet, for example ksiegowosc (at) firma.pl. This reduces the risk of the address being rejected before the message is even sent.
Where problems can arise
The most common limitation is not email delivery itself, but address validation by other systems. A registration form may incorrectly treat a domain containing ł or ó as invalid. An older email application may display the Punycode representation, while an invoicing system or online store may refuse to accept the address in a contact field.
The possibility of mistakes also matters. Recipients accustomed to names without diacritics may type zolw.pl instead of żółw.pl. These are two separate domains that may belong to different entities. Similar-looking characters can also be used in attempts to impersonate a brand, so it is worth communicating an unusual address spelling particularly clearly.
An IDN domain does not automatically affect the trustworthiness of a message. Email authentication mechanisms such as SPF, DKIM and DMARC still need to be configured correctly. Their availability and setup depend on the service provider.
How to introduce such an address without unnecessary risk
Before placing the address on your website, business cards or invoices, you can carry out a brief check:
- Confirm with the registrar that the chosen IDN domain can be registered.
- Ask the email provider whether it supports mailboxes in IDN domains, rather than just websites.
- Create an address with a simple part before
@, for examplekontakt@żółw.pl. - Send test messages to mailboxes with several different providers and reply from them to the IDN address.
- Check the address in the forms, newsletter, CRM, sales system and email signature you use.
- Set up a parallel address without Polish characters and direct both to the same mailbox.
For example, a business operating under the brand name “Żółw” (Polish for “turtle”) may promote the address kontakt@żółw.pl, while also receiving email at kontakt (at) zolw.pl. This requires owning both domains or a suitable alternative domain. That way, customers do not lose contact with the business if their application does not support IDN or if they type the name without Polish characters.
When an IDN domain makes sense
An address in a domain with Polish characters can be a good match for a brand name, place name or surname, and may be easier for a Polish audience to read. However, using it as the only contact address can be risky, especially in international communication and when working with many external systems.
The practical next step is to check whether your email provider supports IDN and set up a test address. Only after testing sending, receiving and entering it into the systems you use should you decide whether it will be your main address or just an additional alias.
See also: What are domains with Polish characters?
Read also
