Overview
Most email issues fall into four buckets:
1) Incoming delivery (MX records)
2) Sending configuration (SMTP settings)
3) Authentication/deliverability (SPF/DKIM/DMARC)
4) Client-side login/password issues
A) Not receiving email
Likely causes
- MX records point to the wrong provider
- Mailbox is full
- Filtering/forwarding rules redirect mail elsewhere
Checklist
1) Confirm MX records match your intended email provider (cPanel/Google/Microsoft).
2) Check mailbox quota in cPanel.
3) Test using webmail:
- If webmail receives but Outlook does not, the issue is Outlook configuration.
B) Not sending email
Likely causes
- Outgoing SMTP not set correctly
- Wrong port/encryption
- Authentication disabled
- Wrong credentials
Best-practice solution
- Use SMTP2GO for sending.
- Ensure SMTP authentication is enabled.
- Use correct SMTP2GO credentials.
C) Emails go to spam
Likely causes
- Missing/incorrect SPF/DKIM/DMARC
- Sending from an unauthorized server (SPF mismatch)
- New domain reputation
- Content triggers (links/attachments/formatting)
Checklist
1) SPF includes your sending provider(s), including SMTP2GO if used.
2) DKIM is enabled and published properly.
3) DMARC is published (start with monitoring).
4) Send a test to Gmail and check “Show original” for PASS results.
D) Password/login errors
- Confirm username is full email address.
- Reset mailbox password in cPanel if unsure.
- Confirm you are not mixing mailbox password (IMAP) with SMTP2GO password (SMTP).
What to include in a support ticket
- Email address affected
- What fails (receiving, sending, spam)
- Which app/device (Outlook/iPhone/Gmail app)
- Exact error text
- Whether webmail works
- Whether you use SMTP2GO
