🔹 Troubleshooting Email Issues #
Email problems are usually caused by DNS misconfiguration, authentication failures, or security restrictions. Follow this guide to identify and fix common email issues quickly.
1️⃣ Emails Not Sending #
If emails fail to send from webmail or email clients:
Check the following first:
-
Correct SMTP server:
mail.yourdomain.com -
SMTP port: 465 (SSL) or 587 (TLS)
-
Authentication: Enabled
-
Correct email password
Common causes & fixes:
-
❌ Wrong SMTP port → Use 465 or 587
-
❌ Authentication disabled → Enable SMTP auth
-
❌ Blocked IP → Contact support to whitelist
-
❌ Firewall blocking SMTP → Use recommended ports
📌 Tip: Webmail sending works, but Outlook fails → client settings issue.
2️⃣ Emails Going to Spam #
Emails landing in spam are caused by trust & reputation issues.
Check these DNS records:
-
✅ SPF configured
-
✅ DKIM enabled in Plesk
-
✅ DMARC added
Other common reasons:
-
New domain with no email history
-
Sending bulk emails suddenly
-
Spam keywords in content
-
Missing company signature
Best practices to fix spam issues:
-
Send emails slowly (warm-up domain)
-
Use a professional email signature
-
Avoid shortened links
-
Don’t send identical emails repeatedly
📌 Gmail & Outlook strongly require SPF + DKIM.
3️⃣ Delayed Email Delivery #
Emails arrive late or after several hours.
Possible reasons:
-
Greylisting by the receiving server
-
Large attachments
-
Poor sender reputation
-
DNS propagation delay
How to fix:
-
Avoid sending large attachments
-
Use Google Drive / OneDrive links
-
Ensure server IP is not blacklisted
-
Wait up to 24 hours after DNS changes
📌 Delays usually resolve automatically if DNS is correct.
🔍 How to Diagnose Email Issues #
Use these tools:
-
Mail headers (check authentication results)
-
MXToolbox (DNS & blacklist check)
-
Plesk Mail Logs
📌 Always test by sending to Gmail + Outlook.
