Android Outlook authentication POP SMTP unable to log-in

Question

Android Outlook authentication POP SMTP unable to log-in

Dr Graham Wilson 0

When trying to update my POP3 SMTP password on Android Outlook, I get an authentication error "unable to log-in". How to fix this?

Dr Graham Wilson 0 Reputation points

2025-06-30T14:25:20.37+00:00

I don't understand why I wasn't presented with any options in posting this message. I had to select Windows, Classic, and for business, as no Android options were offered.

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Dr Graham Wilson 0 Reputation points

2025-06-30T14:25:20.37+00:00

I don't understand why I wasn't presented with any options in posting this message. I had to select Windows, Classic, and for business, as no Android options were offered.

Answer 1

Jade-T 2,310 Microsoft External Staff Moderator

Hi @Dr Graham Wilson

Thank you for reaching out and sharing the difficulties you’re experiencing while updating your POP3/SMTP password in the Outlook app on your Android device.

I completely understand how frustrating it can be when things don’t work as expected, especially when it affects your ability to stay connected. Please rest assured that I’m here to help and will do my best to get this resolved as quickly as possible.

To better understand the situation and provide the most effective support, could you kindly share a bit more information:

Could you please confirm which email provider you are using? (e.g., Outlook.com, Gmail, or a custom domain)
May I ask if two-factor authentication (2FA) is enabled on your account?
Would you be able to tell me if this issue is occurring solely on your Android device or on other devices as well?
Lastly, could you please verify whether you have the latest version of the Outlook app installed on your Android device?

Your input will help us narrow down the cause and provide the most effective solution. We truly appreciate your time and patience, and we’re committed to resolving this for you as quickly as possible.

Please feel free to reach out if you have any questions or need further assistance.

If the answer is helpful, please click "Accept Answer" and kindly upvote it. If you have extra questions about this answer, please click "Comment".

Note: Please follow the steps in our documentation to enable e-mail notifications if you want to receive the related email notification for this thread.

Dr Graham Wilson 0 Reputation points

2025-06-30T15:09:50.02+00:00
Thanks for the speedy reply...

Could you please confirm which email provider you are using? (e.g., Outlook.com, Gmail, or a custom domain)
It is a custom domain.

May I ask if two-factor authentication (2FA) is enabled on your account?
No it isn't

Would you be able to tell me if this issue is occurring solely on your Android device or on other devices as well?
Solely on the Android - I updated them on my Windows app and that's working perfectly

Lastly, could you please verify whether you have the latest version of the Outlook app installed on your Android device?
Yes, I tried that myself before posting on here.
Jade-T 2,310 Reputation points Microsoft External Staff Moderator

2025-07-03T10:11:30.5533333+00:00
Hi @Dr Graham Wilson

Thanks so much for providing that extra information. I really appreciate your patience while I looked into solutions for your custom domain email on Outlook for Android. I understand how frustrating it must be to face login issues on your Android device, especially when everything works fine on Windows.

Based on what you’ve shared, using a custom domain, no two-factor authentication, and the issue being isolated to Android only. Here are a few steps that may help resolve the authentication error:

1. Clear Outlook App Cache and Data

Sometimes, corrupted app data can cause authentication problems. This step effectively gives your Outlook app a fresh start without deleting your account itself from the mail server.

Go to Settings > Apps > Outlook > Storage

Tap Clear Cache and then Clear Data

Reopen the Outlook app and try logging in again with your updated password

2. Remove and Re-add Your Email Account

If clearing the cache doesn't work, completely removing and then re-adding your account ensures all settings are applied freshly.

Open the Outlook app

Go to Settings > Accounts

Remove the affected email account

Once removed, add it again, carefully entering your POP3/SMTP settings manually.

3. Double-Check Your POP3/SMTP Configuration

Even a tiny detail can make a difference. Please carefully confirm the following settings with your custom domain's email hosting provider. The common settings are:

Incoming Mail Server (POP3):

Server: mail.yourdomain.com (or as provided by your email host, e.g., pop.yourdomain.com)

Port: 995

Encryption: SSL/TLS (often just labeled SSL)

Requires Authentication: Yes

Outgoing Mail Server (SMTP):

Server: smtp.yourdomain.com (or as provided by your email host)

Port: 587

Encryption: STARTTLS (or sometimes just TLS or SSL)

Authentication required: Yes (usually using the same username and password as your incoming mail server)

If you're unsure about these values, I highly recommend checking your email hosting provider's support documentation or contacting them directly to confirm the exact server details for Android devices.

4. Check for Device Security Policies

If your email is managed by an organization, ensure your Android device complies with any required security settings (e.g., screen lock, encryption).

If the issue continues even after following all the steps, we may need to look into it more closely. In that case, I recommend opening a support ticket so we can gather detailed logs and escalate the issue if needed.
Jade-T 2,310 Reputation points Microsoft External Staff Moderator

2025-07-09T10:46:44.4366667+00:00

Hi @Dr Graham Wilson

Just following up to see if the Outlook issue on your Android device has been resolved. Let me know if you need any further assistance. I'm happy to help.

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Android Outlook authentication POP SMTP unable to log-in

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