Outbound SMTP

Information about the Outbound SMTP service, how to configure and information on how to setup your account.

Port Number for Outbound SMTP
The default port for Outbound SMTP is port 25. However your Internet service provider may be blocking outbound SMTP on that port.  Outbound SMTP is ...
Tue, 20 Jan, 2015 at 12:22 AM
SMTP settings
Email delivery problems can often be difficult to troubleshoot, as there are many points along the way where a message could be delayed, rejected, or even...
Mon, 19 Sep, 2016 at 6:35 PM
How do I use SPF?
This document sets out some basic info on how to integrate our DNS and Dyn Email services with SPF (Sender Policy Framework). For more info on SPF, vist htt...
Tue, 27 Nov, 2018 at 6:08 PM
DuoCircle Standard SMTP Abuse Information
The DuoCircle Standard SMTP service provides a secure, authenticated outbound SMTP relay server. Unfortunately, it is inevitable that it may sometimes be ab...
Thu, 15 Jan, 2015 at 1:21 AM
Checking SMTP Outbound Credits.
Login to the Admin Portal https://admin.duocircle.com >> Click My Services >> click your SMTP service. The service details page will display ...
Mon, 29 Feb, 2016 at 11:45 PM
Outbound SMTP SPAM Filtering
In an attempt to minimize spam and improve the deliverability of legitimate email we are now spam filtering outbound email send via outbound.mailhop.org....
Thu, 2 Apr, 2015 at 4:40 AM
What is DMARC?
DMARC stands for “Domain-based Message Authentication, Reporting & Conformance.” DMARC is protocol that uses SPF andDKIM to determine the authenticity o...
Tue, 19 Apr, 2016 at 10:54 PM
IP Addresses of SMTP Servers
The following addresses are only for outbound SMTP customers. They are not required for spam filtering clients.   Netblocks 104.232.45.0/24 Ou...
Mon, 9 Jul, 2018 at 4:21 PM
DMARC May Impact Your Deliverability
Changes at Gmail, Yahoo and others may impact your deliverability - are you prepared for DMARC? In an effort to reduce spam and spoofing, email prov...
Fri, 24 Jun, 2016 at 7:16 PM
SMTP Usage Email Notification
DuoCircle will send SMTP customers email notifications to the email address associated with their DuoCircle account alerting them when they have used 80%,...
Thu, 4 Aug, 2016 at 4:39 PM