Sync & Connection (Outlook/IMAP)
27 articles
The Master List of Gmail SMTP Response Codes
When sending email through Google’s SMTP servers (smtp.gmail.com or smtp-relay.gmail.com), every transaction produces an operational status…
Resolving “5.5.1” Authentication Required (SMTP)
When sending mail through an automated script, web framework, network scanner, or desktop email client, your…
“IMAP server issued an unrecognized greeting”
When setting up or synchronizing an email account inside a desktop client (such as Microsoft Outlook,…
How to Reset Gmail “OAuth2” Token (Outlook)
When you connect a Gmail or Google Workspace account to Microsoft Outlook, modern authentication uses OAuth…
Troubleshooting Outlook “Sent” Folder Sync Lag
When sending emails from Microsoft Outlook configured with an IMAP or Microsoft 365 profile, sent messages…
“Connection to server failed” (Gmail Android)
When opening the Gmail app on an Android device—or when adding an Exchange, Microsoft 365, or…
Resolving “Account exceeds bandwidth limits”
When opening an email client or trying to check messages via IMAP or webmail, you may…
“0x800CCC78” Unknown Sender in Outlook
When attempting to send an email using Microsoft Outlook configured with an IMAP or POP account,…
How to Fix Gmail “Recent Mode” POP3 Errors
If you use multiple email clients or mobile devices to retrieve email via POP3 from a…
SMTP Error “530 5.7.0 Must issue STARTTLS”
When sending an email from an automated script, web form, network copier, or custom application, your…
Troubleshooting “Folder size limit exceeded”
When organizing emails or running mail migrations, you may see an error like “Folder size limit…
How to Increase IMAP Folder Limits
Desktop email clients and mail migration tools can slow down, freeze, or drop connections when working…