What is my SMTP Hostname?

Filtering Server Hostnames

These are the hostnames to configure in your Sending MTA/Server. Please refer to your manufacturers documentation on how to configure for your environment:

  • SMTP outbound filter hostname: smtp.antispamcloud.com (port 587/465/25)

We do not recommend using port 25 for sending outbound mail to the filter.

Regional specific records

These regional specific records are only to be used if you require mail to be received by servers in a specific region.

We do not recommend using these regional records unless absolutely necessary.

Using the below records forces usage of our EU/US/UK/AU/CA/ZA server infrastructure, however deliveries may still be routed via our international platform. Please contact support to force-set your customer ID to EU/US-only delivery servers to ensure messages are not re-routed internationally.

  • EU-only: eu.smtp.antispamcloud.com (port 587/465/25)
  • US-only: us.smtp.antispamcloud.com (port 587/465/25)
  • UK-only: uk.smtp.antispamcloud.com (port 587/465/25)
  • AU-only: au.smtp.antispamcloud.com (port 587/465/25)
  • CA-only: ca.smtp.antispamcloud.com (port 587/465/25)
  • ZA-only: za.smtp.antispamcloud.com (port 587/465/25)

We do not recommend using port 25 for sending outbound mail to the filter.

Local Cloud Only

If you wish to use port 25 for outgoing email, you will need to specify a secondary IP which will be configured to listen to port 25. You will then be required to update the sending servers.

Please note, using port 25 is not recommended for outgoing mail. You should also restrict outgoing mail in your firewall to stop scammers or malware from sending mail from your IP addresses.

To configure this, Please contact Spam Experts support .

Branded SPF hostname

If you want to use your own domain in your clients' SPF records, use the "include" option:

  1. Create a subdomain for the domain you wish to add to your clients SPF spf.example.com (spf.example.com).
  2. Create a TXT record for spf.example.com (spf.example.com) with the following details:
  3. v=spf1 include:spf.antispamcloud.com -all

  4. Add the following TXT record to your clients' domain DNS:
  5. v=spf1 include:spf.example.com -all