Monitoring FTP, SMTP, IMAP, and POP3: Keep Legacy Services Alive

Not everything runs on HTTP. FTP servers handle file transfers for enterprise workflows. SMTP relays route critical transactional emails. IMAP and POP3 servers let employees access their mailboxes. These legacy protocols are the backbone of business operations — and they need monitoring too.

SMTP Monitoring

Your transactional emails (password resets, order confirmations, invoices) depend on your SMTP server. If it goes down, customers cannot reset passwords, receipts do not arrive, and support tickets pile up.

Monitorion's SMTP monitor connects to your mail server, performs a proper SMTP handshake, and verifies:

• The server accepts connections on port 25/465/587
• The SMTP banner is returned (server identity)
• STARTTLS is supported (if configured)
• Authentication works (optional)
• Connection latency is within acceptable bounds

Set up: Monitors → New Monitor → SMTP. Enter your mail server hostname and port.

IMAP and POP3 Monitoring

If your team uses a self-hosted mail server (Dovecot, Exchange, Zimbra), IMAP and POP3 monitoring ensures employees can access their email.

The monitor connects to the mail server, verifies the protocol handshake, and optionally authenticates with test credentials to confirm the service is fully operational — not just accepting connections.

Set up: Monitors → New Monitor → IMAP (or POP3). Enter hostname, port (993 for IMAP SSL, 110 for POP3), and optional credentials.

FTP Monitoring

FTP is everywhere in enterprise: automated file drops, backup transfers, partner data exchanges, print shop integrations. When the FTP server goes down, entire business processes stop.

Monitorion's FTP monitor connects to your server, verifies the login (anonymous or authenticated), and optionally confirms FTPS (TLS) is available.

Set up: Monitors → New Monitor → FTP. Enter hostname, port (21), and credentials if needed.

Monitoring Strategy for Legacy Services

• Check interval: 1-5 minutes. These services are critical and failures should be caught fast.
• Alerts: Enable SMS for critical mail servers — email alerts do not help when the email server is down.
• Authentication checks: A server that accepts connections but rejects logins is effectively down. Always test with credentials when possible.
• Port monitoring as backup: Add a simple port monitor alongside the protocol-specific monitor. If the port closes, you know it is a network/firewall issue, not an application problem.

All protocol monitors are available on Pro plans. Start monitoring your infrastructure — modern and legacy alike.