With Iridis mailRelay, you can reliably send email via SMTP from Applications and Mail Servers, compatible with Cloud and On-Premise.
Need to send large volumes of email reliably? Has the “free” SMTP relay provided by your broadband or hosting provider become unreliable, restrictive, or affected by poor IP reputation?
mailRelay provides a fast, reliable outbound SMTP relay service designed to work with your existing Exchange server, mail server, application or SMTP-enabled device. In most cases, getting started takes just a few minutes, with your existing system simply configured to route outbound email through our secure mailRelay smarthost platform.
Our service is delivered from dual UK data centres, providing resilience and high availability while helping ensure dependable email delivery.
Behind the scenes, our load-balanced SMTP infrastructure is actively managed by our experienced in-house team. We continuously maintain and monitor the platform, its delivery infrastructure and IP reputation to provide a dependable outbound email service without the complexity of operating your own high-volume mail delivery platform.
Customers also have access to our secure management console, providing clear visibility into their mailRelay service. From the console you can track and trace individual emails, review daily delivery reports, monitor usage and sending volumes, and quickly investigate delivery issues without having to trawl through local mail server logs.
Whether you are sending transactional email, system notifications, business communications or larger volumes of legitimate outbound mail, mailRelay provides a reliable, professionally managed SMTP delivery platform built for business use.
Managed SMTP relay service, providing cost effective email delivery from Cloud and On-Premise applications and servers
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Package quotas are per calendar month during the annual term.
Sending more than 1,000,000 emails per month? Contact us to discuss your specific requirements.

DKIM signing can be optionally enabled, allowing us to digitally sign your outbound emails to allow recipients to verify the authenticity of them.

Improve deliverability using our managed SPF 'include' facility

TLS 1.2 and 1.3 is supported as standard, ensuring where supported by the recipient email is transferred across the Internet in an encrypted state.

Email is scanned for virus, malware and spam content before sending to assist in protecting you against threats and junk mail originating from your servers.

Upgrade quickly and easily as your business grows. Scale from thousands to millions of messages per month.

Client vetting and technical measures ensure we maintain a good reputation with corresponding delivery rates.

Integrate with your on-premise Exchange server, applications or even multi functional print devices.

Integrate with Cloud hosted applications. Compatible with services hosted within Azure (M365) and AWS.

Hosted in two physically and logically separate UK data centres to provide the highest availability.

No scripts, no inexperienced staff, just friendly and dependable UK based support.
No scripts, no inexperienced staff, just friendly and dependable UK based support via email.
Find answers to some frequently asked questions about SMTP
mailRelay is a managed SMTP email service to provide fast and reliable outbound delivery of emails, developed and supported by our in-house team of email experts.
mailRelay is used by many of our clients to send emails from their Azure hosted services and virtual machines. Alternate port numbers provide reliable access via TCP/587 or TCP/2525 where port TCP/25 may be blocked.
Adding a dedicated IP to the mailRelay service can be beneficial if you have specific security requirements or send high volumes of email. However, if you send modest volumes of email a dedicated IP can hamper delivery by virtue of having a lack of track record for sending.
Your application needs to send transactional email.
Your website needs reliable outbound email delivery.
Your on-premise Exchange server needs an external SMTP smarthost.
Your cloud application cannot reliably send directly to the Internet.
Your ISP blocks outbound TCP/25.
You want a managed SMTP infrastructure rather than operating your own outbound mail servers.
You want optional dedicated IP infrastructure.
You want UK-hosted SMTP infrastructure and UK-based support.
mailRelay supports sending emails up to 50MB each.
As part of our strict antispam policy we review all mailRelay orders to prevent misuse so activation is up to 1 working day, though typically it is within a few working hours.
No, as mailRelay compliments your existing mail flow so can work in tandem with your current mailbox hosting. Many clients use mailRelay with domains hosted within Microsoft 365 or on-premise Exchange servers.
By harnessing our reputation for sending 'good' email you will achieve high delivery rates to your clients, whilst avoiding the need to manage a mail infrastructure to send email.
Yes, mailRelay is compatible with on-premise premise and multi-function devices allowing you to send reliably and securely.
Yes. Iridis mailRelay can send email from your website using SMTP. It’s suitable for contact forms, transactional emails, notifications and other application-generated messages. Your website can remain hosted elsewhere; you simply configure it to use mailRelay as its outbound SMTP server.
Iridis mailRelay includes a secure control panel that allows you to track and trace email delivery outcomes, along with enabling daily delivery reports in CSV format.
SPF and DKIM are supported as standard, integrating with your DMARC record. Follow our quick setup steps with our SPF, DKIM and DMARC guide.
If you are not happy with mailRelay for whatever reason, we’ll refund your payment. No hassle, no risk.
No scripts, no inexperienced staff, just friendly and dependable UK based support via email.
