---
title: SMTP Connections
description: The address for our SMTP service is smtp.socketlabs.com.
---
[Skip to content](https://help.socketlabs.com/docs/smtp-connections#main-content)
English
Show submenu for translations
[Contact us](https://help.socketlabs.com/docs/kb-tickets/new?hsLang=en)
[](https://www.socketlabs.com/)
Open main navigation
Close main navigation
- English
Show submenu for translations
- [Contact us](https://help.socketlabs.com/docs/kb-tickets/new)
SocketLabs is here to help!
- There are no suggestions because the search field is empty.
1. [Help Center](https://help.socketlabs.com/docs?hsLang=en)
2. [Fundamentals](https://help.socketlabs.com/docs/fundamentals?hsLang=en)
# SMTP Connections
## The address for our SMTP service is smtp.socketlabs.com.
The IP address for smtp.socketlabs.com can change frequently because we employ widely geographically-distributed SMTP servers for high availability. Please ensure that your connections to our services are not programmed with specific IP addresses and are properly resolving and connecting to smtp.socketlabs.com.
### Ports SocketLabs accepts connections from
We accept connections on ports 25, 2525, 587, and 465. Please note that connections to port 465 require the use of implicit SSL.
### IPs to Allow When Using a Firewall
Those able to enter CIDR ranges to their firewalls should open up 142.0.176.0/20, as future upgrades may result in the inclusion of other IP addresses in this range.
If you are concerned about allowing outbound SMTP traffic (port 25) to any IP as an alternative to programming specific IPs into your firewall, you may want to consider allowing outbound traffic to the lesser-used port 2525 on any IP, and configure your applications to connect to us on port 2525 instead of port 25.
If you are having problems connecting to smtp.socketlabs.com, see our article on troubleshooting common connection issues, [Diagnosing SMTP Connection Issues to SocketLabs.](https://help.socketlabs.com/docs/diagnosing-smtp-connection-issues-to-socketlabs?hsLang=en)
- [Fundamentals](https://help.socketlabs.com/docs/fundamentals?hsLang=en#main-content)
- [StreamScore](https://help.socketlabs.com/docs/fundamentals?hsLang=en#streamscore)
- [Reports](https://help.socketlabs.com/docs/fundamentals?hsLang=en#reports)
- [Frequently Asked Questions](https://help.socketlabs.com/docs/fundamentals?hsLang=en#frequently-asked-questions)
- [Advanced](https://help.socketlabs.com/docs/advanced?hsLang=en#main-content)
- [Security](https://help.socketlabs.com/docs/advanced?hsLang=en#security)
- [DNS Authentication](https://help.socketlabs.com/docs/dns-authentication?hsLang=en#main-content)
- [DKIM](https://help.socketlabs.com/docs/dns-authentication?hsLang=en#dkim)
- [SPF and Custom Bounce Domain](https://help.socketlabs.com/docs/dns-authentication?hsLang=en#spf-and-custom-bounce-domain)
- [Deliverability](https://help.socketlabs.com/docs/deliverability?hsLang=en)
- [For Developers](https://help.socketlabs.com/docs/for-developers?hsLang=en#main-content)
- [Event Webhooks](https://help.socketlabs.com/docs/for-developers?hsLang=en#event-webhooks)
- [Integrations](https://help.socketlabs.com/docs/integrations?hsLang=en#main-content)
- [Languages and Frameworks](https://help.socketlabs.com/docs/integrations?hsLang=en#languages-and-frameworks)
- [Mail Servers](https://help.socketlabs.com/docs/integrations?hsLang=en#mail-servers)
- [Web Clients and Plug-ins](https://help.socketlabs.com/docs/integrations?hsLang=en#web-clients-and-plug-ins)
- [Mail Clients](https://help.socketlabs.com/docs/integrations?hsLang=en#mail-clients)
- [Marketing Tools](https://help.socketlabs.com/docs/marketing-tools?hsLang=en#main-content)
- [Tips and Tricks](https://help.socketlabs.com/docs/marketing-tools?hsLang=en#tips-and-tricks)
- [Troubleshooting](https://help.socketlabs.com/docs/troubleshooting?hsLang=en#main-content)
- [SocketLabs Inbound SMTP Gateway Errors](https://help.socketlabs.com/docs/troubleshooting?hsLang=en#socketlabs-inbound-smtp-gateway-errors)
- [SocketLabs Outbound SMTP Errors](https://help.socketlabs.com/docs/troubleshooting?hsLang=en#socketlabs-outbound-smtp-errors)
- [Spotlight Email Analytics](https://help.socketlabs.com/docs/spotlight-email-analytics?hsLang=en)
- [Hurricane MTA](https://help.socketlabs.com/docs/hurricane-mta?hsLang=en#main-content)
- [Advanced Hurricane Usage](https://help.socketlabs.com/docs/hurricane-mta?hsLang=en#advanced-hurricane-usage)
- [Upgrading Hurricane](https://help.socketlabs.com/docs/hurricane-mta?hsLang=en#upgrading-hurricane)
- [Troubleshooting](https://help.socketlabs.com/docs/hurricane-mta?hsLang=en#troubleshooting)
- [Hurricane Maintenance](https://help.socketlabs.com/docs/hurricane-mta?hsLang=en#hurricane-maintenance)
- [Getting Started with Hurricane](https://help.socketlabs.com/docs/hurricane-mta?hsLang=en#getting-started-with-hurricane)
- [Basic Hurricane Usage](https://help.socketlabs.com/docs/hurricane-mta?hsLang=en#basic-hurricane-usage)
- [Complex Sender](https://help.socketlabs.com/docs/complex-sender?hsLang=en)
[](https://www.socketlabs.com)
Copyright © 2026, SocketLabs LLC