Sync & Connection (Outlook/IMAP)
27 articles
Resolving “Sent Items” Duplication (Outlook/Gmail)
When using Microsoft Outlook configured with a Gmail or Google Workspace account via IMAP, every outgoing…
“0x80040115” Connection to Exchange/Sync Lost
Microsoft Outlook users working with Microsoft 365, on-premises Microsoft Exchange, or profile-sync bridges (such as Google…
How to Fix Gmail Port 587 vs. 465 Timeouts
When configuring custom applications, mail clients, network printers, or automated scripts to send outbound email through…
“Invalid Credentials” in Apple Mail
Apple Mail (macOS and iOS) can suddenly display an alert stating “Invalid Credentials,” flag an account…
Troubleshooting SMTP Relay: “550 5.7.1 Relaying Denied”
When an internal server, multi-function printer (MFP), network scanner, or web application tries to send an…
How to Resolve Outlook 365 “Credential Loop”
If Microsoft Outlook continuously prompts you for your password—flashing the login dialog, accepting your credentials, and…
Fix: “535 5.7.8” (Authentication Failed)
The error “535 5.7.8: Username and Password not accepted” or “535 5.7.8 Authentication Failed” is an…
Why Gmail IMAP is Stuck on “Syncing Subscribed Folders”
When using desktop mail clients like Microsoft Outlook, Apple Mail, or Mozilla Thunderbird configured with Gmail…
Fix: “This sender has failed our fraud detection checks”
When opening an inbound message in Gmail, you may encounter an aggressive red or yellow warning…
“0x800CCC0E” Outlook Cannot Connect
The “0x800CCC0E” error code in Microsoft Outlook indicates a hard network socket failure where your email…
Troubleshooting “Less Secure Apps” Shutdown Alternatives
Google’s complete shutdown of the “Less Secure Apps” setting means traditional basic authentication, logging into third-party…
IMAP “Too many simultaneous connections”
Receiving the IMAP “Too many simultaneous connections” error means your email client or devices have maxed…