On this page, we'll go over some common problems you might encounter while using Fastmail.
If you are looking for general information about migrating from Pobox to Fastmail, please see our Guide to Fastmail for Pobox users help page.
Unable to log in
If you are having trouble logging in, please check to make sure that you are logging in at app.fastmail.com and entering the correct username.
Your username should be the same as your Pobox reference address. Please be sure that you are entering the full email address, including the domain, into the login form. As an example, if your username is myaddress@domain.com, you will need to enter myaddress@domain.com instead of only typing myaddress.
If you have forgotten your username or password, or if you have lost your 2FA device, you can use our account recovery tool to regain access to your account.
We strongly recommend set up a recovery email address and/or phone number in case you ever need to use the account recovery tool. You can set up recovery options by going to the Settings → Privacy & Security screen, find the Account recovery section, and clicking Add recovery options. For more information on adding recovery options, please see our Passwords help page.
For more in-depth information on this problem, please see our I can't log in! help page.
Unable to receive any mail
There are several things can cause problems with mail delivery, such as:
- If your account is overdue
- If your mail storage is full
- If your custom domain is not working
- If you have a rule that is sending mail to Trash
- If you are using a mail client that has not been properly set up
For a complete guide that will walk you through troubleshooting this problem, please see our I'm unable to receive mail! help page.
Unable to send mail
If you see a warning in the Fastmail web interface that says "Send failed! Sorry, you can't send messages at this time," this means that we've detected bulk sending from your account. Fastmail is not designed for bulk sending, and our Terms of Service prohibits sending duplicative email. You will need to contact our support team to discuss next steps.
If you are having trouble sending from a mail client, please check that your SMTP settings are correct.
I need help with something else
If you are unable to find the cause of your problem, you may be able to find the information you’re looking for by searching Fastmail’s comprehensive Help Center.
If you would like assistance, please submit a ticket through our support form and our support team will be happy to look into this for you.
The support form is web-based, which means that you will be able to communicate with the support team even if your account is not able to send or receive mail.