Services - Managed DNS - NO-IP Plus

Alternate Port SMTP - Send email from home or on the go

  • Send email even when port 25 is blocked
  • Send larger file attachments
  • Avoid emails blacklists and your messages markedspam
  • Never change your smtp settings when travelling
  • Avoid unaccepted mail due to no reverse DNS (no PTR record)
Add No-IP™ Alternate-port SMTP
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How it Works

ISPs often block port 25, the port on which email is sent. This is done to prevent spam from unwitting or compromised computers. But this also blocks many legitimate users who would like to send email from their personalized accounts. Other spam stopping techniques, such as requiring reverse DNS also hinder legitimate users who want to send email. No-IP's Alternate-port SMTP gets around these problems by letting you inject mail to our system for delivery. We take care of the details and you just send. Not only that, when using Internet connections provided at airports, hotels, friend's places, even at work, you'll never have to change your SMTP settings!

No-IP's Alternate-port SMTP can easily be used with almost any modern email client or server, including Outlook, Outlook Express, and Exchange. If your mail server supports a smarthost/nexthop configuration and SMTP AUTH it will work with Alternate-port SMTP.

The Details

Alternate-port SMTP uses a quota system based on relays. A relay is effectively each recipient of the message. So one message with ten recipients is ten relays. Blocks of relays range from 150-750 per day. The usage is reset each night at midnight Pacific time. The maximum message size that can be sent is around 25 MB, easily accommodating most large messages. Remember, the purpose of Alternate-port SMTP is to help legitimate email senders overcome burdensome restrictions. It is not intended to help spammers. Those found sending spam will be banned without refund, in accordance with the No-IP Terms of Service.

Internet Service Providers known to block port 25
  • AT&T
  • Bell South
  • Cable One
  • Charter
  • Comcast
  • EarthLink
  • Flashnet
  • MediaOne
  • MindSpring
  • MSN
  • NetZero
  • People PC
  • Sympatico
  • Verio
  • Verizon
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