![]() In addition to the SASL XOAUTH2 protocol documentation, you may also want to read Using OAuth 2.0 to Access Google APIs for further information on implementing an OAuth 2.0 client. ![]() As long as these libraries support the Simple Authentication and Security Layer (SASL), they should be compatible with the SASL XOAUTH2 mechanism supported by Gmail. Libraries and SamplesĪccessing mail using IMAP or POP and sending mail using SMTP is often done using existing IMAP and SMTP libraries for convenience. If using OAuth, make sure that the access token used is valid (if you try to use an access token older than 1 hour, it might be invalid). After that, the client can reconnect, authenticate again, and continue. When the time elapses and the session expires, Gmail closes the connection with a message saying that the session expired. A session in this context is one continuous TCP connection. If the session was authenticated using OAuth credentials, it's limited to about the validity period of the access token used (usually 1 hour). Gmail IMAP sessions are limited to about 24 hours. Gmail POP sessions are limited to about 7 days. If your client begins with plain text, before issuing the STARTTLS command, use port 465 (for SSL), or port 587 (for TLS). The outgoing SMTP server,, supports TLS. Incoming connections to the IMAP server at :993 and the POP server at :995 require SSL. The SASL XOAUTH2 protocol documentation describes the SASL XOAUTH2 mechanism in great detail, and libraries and samples which have implemented the protocol are available. The SASL XOAUTH2 mechanism enables clients to provide OAuth 2.0 credentials for authentication. IMAP, POP, and SMTP use the standard Simple Authentication and Security Layer (SASL), using the built-in the native IMAP AUTHENTICATE, POP AUTH, and SMTP AUTH commands, to authenticate users. The Gmail IMAP, POP, and SMTP servers have been extended to support authorization via the industry-standard OAuth 2.0 protocol. You can add any additional accounts in Settings > Mail > Accounts > Add Accounts.For non-Gmail clients, Gmail supports the standard IMAP, POP, and SMTP protocols. Then, reinstall the Mail app from the App Store, launch it, and sign in with your email address. Go to Settings > General > iPhone Storage > Mail and tap Delete App to remove the Mail app. That should give you a clean slate to start setting up your email accounts from scratch, avoiding any issues with the current setup. This will restore any settings you may have tampered with to default and possibly fix the problem of your iPhone email not updating.Īlthough Mail is part of the iPhone's stock app portfolio, you can reinstall it just like any other app. Delete and Reinstall the Mail AppĪ sure method to reset any possible in-app issues is to delete and reinstall the app itself. If you wish to update your email even quicker, manually refresh the Mail app. You want to set it to the quickest update interval possible- Every 15 Minutes. Next, select an update frequency from the Fetch Schedule below the Accounts menu. And for accounts that do not offer a Push option (such as Gmail accounts), select Fetch. If you only have trouble with a specific mailbox, tap it from the Accounts list and select Push from the menu on the next page. You should then force-quit and reopen the Mail app to see if the problem persists. After completing the network settings reset, you must manually reconnect to any Wi-Fi network. This will reset Wi-Fi networks and passwords, cellular settings, and any VPN/APN settings you've used before. To do so, go to Settings > General > Transfer or Reset iPhone > Reset > Reset Network Settings. You can fix any underlying connectivity issues by resetting your network settings. If nothing has changed, try the manual refresh in #1 above. ![]() Here's a guide to using and customizing the Control Center on your iPhone.Īfter that, wait 10 seconds, turn off Airplane Mode, then check your Mail app. You could also tap Airplane Mode on and off from your Control Center. To refresh your connection, open your iPhone's Settings app and turn on the switch next to Airplane Mode. ![]() Toggle Airplane Mode On and OffĪ connectivity issue can cause your iPhone email to quit updating. This should prompt the app to (re)connect to the email servers. Open the app's inbox, drag your finger down the screen until you see a spinning wheel, then release it. ![]() Try to refresh your Mail app before attempting anything more complicated manually. ![]()
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