Outgoing email is easy to forget until customers stop receiving receipts and password resets. Monitor your SMTP server’s availability and encryption so mail keeps flowing.
Order confirmations, invoices, password resets and alerts all leave through SMTP. If the server goes down, nothing on your site looks broken. Customers simply do not get the email.
An SMTP monitor connects to the server the way a mail client does, over the encryption you use, and warns you the moment it cannot.
Every check is stored in a full log, so you can see exactly when and how something changed.
Not encrypted, SSL/TLS or STARTTLS, matching your configuration.
Supply credentials when the server requires login.
25, 465, 587 or any other.
Watch how fast the server greets connections.
From sign-up to your first alert in a few minutes.
Match what your application or mail client uses.
SSL/TLS or STARTTLS as configured.
Any failed connection triggers your notification channels.
Sensible defaults get you started; every option below can be tuned per monitor.
| Setting | What it does |
|---|---|
| Domain / IP | The SMTP server to monitor. |
| Port | Port for SMTP communication, e.g. 25, 465 or 587. |
| Encryption | Not encrypted, SSL/TLS or STARTTLS. |
| Username & password | Credentials if authentication is required. |
| Frequency | How often the check runs: 1 to 120 minutes. The Free plan checks from every 15 minutes; Premium from every minute. |
| Locations | Run the check from one or several of 9 locations: Spain, France, United Kingdom, USA (New York, Los Angeles), Australia, Singapore, Japan and Germany. |
| Notifications | Pick any of your pre-configured alert channels: e-mail, SMS, Telegram, Slack, Messenger, voice call, webhooks and more. |
| Status page | Make the statistics of this monitor public or private. |
| Tags | Group monitors with tags to keep large accounts tidy. |
| IP version | Force IPv4, IPv6, or let Upzilla use whichever is available. |
Protect password resets, receipts and notifications.
Monitor your own Postfix, Exim or Exchange server.
Check third-party SMTP relays your app depends on.
Confirm the server is up before a large campaign.
Create as many notification methods as you like, even on the free plan.
Use the port your application sends through: usually 587 (submission with STARTTLS), 465 (implicit TLS) or 25 (server-to-server).
It checks the connection and, if configured, authentication. It does not deliver messages.
Yes, add POP3 or IMAP monitors, or see Mail Server Monitoring for the full picture.
Credentials are only used for the check you configure. Use a dedicated low-privilege account where possible.
No card required. 10 monitors of any type, free.