2,597 questions
Azure AD B2C Email Address Format Support
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Tarkowski, Michael (M.)
156
Reputation points
We have questions about what does Azure AD B2C support when a new user tries to complete the signup user flow for the 1st time. Using the default setup, out-of-the-box configuration, and no customer custom policies added.
- What characters are allowed for email addresses?
- What characters are not allowed for email addresses?
- What is the minimum and maximum character length allowed for each portion of the email address?
- Are the email standards RFC 5322 and 5321 supported for email addresses?
Microsoft Security | Microsoft Entra | Other
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Marilee Turscak-MSFT 37,206 Reputation points Microsoft Employee Moderator2022-06-03T23:41:01.663+00:00 J believe the requirements would be similar to the Microsoft 365 requirements for email, but I've reached out to the product team to confirm.
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![](data:image/svg+xml, %3Csvg xmlns='http://www.w3.org/2000/svg' height='64' class='font-weight-bold' style='font: 600 30.11764705882353px "SegoeUI", Arial' width='64'%3E%3Ccircle fill='hsl(57.599999999999994, 56.00000000000001%, 15%)' cx='32' cy='32' r='32' /%3E%3Ctext x='50%25' y='55%25' dominant-baseline='middle' text-anchor='middle' fill='%23FFF' %3EYW%3C/text%3E%3C/svg%3E)
YULONG WANG 0 Reputation points2023-10-04T05:30:15.7833333+00:00 Have you confirmed that?
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Tarkowski, Michael (M.) 156 Reputation points
2023-10-04T11:28:12.7933333+00:00 Spent a lot of time on getting the details I was looking for. What I ended up doing was testing every keyboard character in a new email address. For the test each character had to be tested in multiple ways (beginning/end of personal part, repeated instances, etc.). The Azure AD B2C portal has a validation script running to alert you if the email address is not acceptable however, it does not catch everything. Literally have to create a username to absolutely confirm its character combination acceptance.
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