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	<title>&#45; CircleID</title>
	<link>https://www.circleid.com/blogs/</link>
	<description>Postings from  on CircleID</description>
	<dc:language>en</dc:language>
	<dc:rights>Copyright 2026, unless where otherwise noted.</dc:rights>
	<dc:date>2026-04-14T18:21:00+00:00</dc:date>

	
	<item>
		<title> Port25 Announces Release of PowerMTA V4.5r5 (Featured Blog)</title>
		<guid isPermaLink="true">https://circleid.com/posts20160516_port25_announces_release_of_powermta_v45r5</guid>
		<link>https://circleid.com/posts20160516_port25_announces_release_of_powermta_v45r5</link>
		<description><![CDATA[Port25, A Message Systems Company, has just released its latest version of PowerMTA v4.5r5 and PowerMTA Management Console v1.5r5. Highlighted here are the major features of this particular release <a href="https://circleid.com/posts20160516_port25_announces_release_of_powermta_v45r5">More...</a>]]></description>
		<dc:date>2026-04-14T11:21:00-07:00</dc:date>
	</item>
	
	<item>
		<title> New Case Study: Jobtome.com Replaces 30 Postfix Servers with a Single PowerMTA (Featured Blog)</title>
		<guid isPermaLink="true">https://circleid.com/posts20160531_jobtomecom_replaces_30_postfix_servers_with_a_single_powermta</guid>
		<link>https://circleid.com/posts20160531_jobtomecom_replaces_30_postfix_servers_with_a_single_powermta</link>
		<description><![CDATA[Jobtome.com helps job seekers access millions of jobs gathered from hundreds of thousand's of recruitment agencies and employer sites across Europe. <a href="https://circleid.com/posts20160531_jobtomecom_replaces_30_postfix_servers_with_a_single_powermta">More...</a>]]></description>
		<dc:date>2026-04-14T11:21:00-07:00</dc:date>
	</item>
	
	<item>
		<title> An Update on Port25 and the Future of PowerMTA - One Year Later? (Featured Blog)</title>
		<guid isPermaLink="true">https://circleid.com/posts20160425_an_update_on_port25_and_future_of_powermta_one_year_later</guid>
		<link>https://circleid.com/posts20160425_an_update_on_port25_and_future_of_powermta_one_year_later</link>
		<description><![CDATA[The following is written by Juan Altmayer Pizzorno, the original author of PowerMTA. Pizzorno has been developing email server software for over 25 years and currently serves as Sr. VP of Research &amp; Development at SparkPost. He co-founded and was CTO of Port25 Solutions. <a href="https://circleid.com/posts20160425_an_update_on_port25_and_future_of_powermta_one_year_later">More...</a>]]></description>
		<dc:date>2026-04-14T11:21:00-07:00</dc:date>
	</item>
	
	<item>
		<title> Encrypting Inbound and Outbound Email Connections with PowerMTA (Featured Blog)</title>
		<guid isPermaLink="true">https://circleid.com/posts20160418_encrypting_inbound_and_outbound_email_connections_with_powermta</guid>
		<link>https://circleid.com/posts20160418_encrypting_inbound_and_outbound_email_connections_with_powermta</link>
		<description><![CDATA[Encryption is becoming increasingly necessary when transferring data across the internet, and email is no different. In PowerMTA 4.5 and later there are several methods to encrypt both inbound and outbound connections. Here we'll provide a quick overview of how they may be achieved. Keep in mind, this document only deals with encrypting the channel, not the content. <a href="https://circleid.com/posts20160418_encrypting_inbound_and_outbound_email_connections_with_powermta">More...</a>]]></description>
		<dc:date>2026-04-14T11:21:00-07:00</dc:date>
	</item>
	
	<item>
		<title> V12 Group Sustains Customer Satisfaction by Deploying PowerMTA for Launchpad Platform (Featured Blog)</title>
		<guid isPermaLink="true">https://circleid.com/posts20160322_v12_group_sustains_customer_satisfaction_by_deploying_powermta</guid>
		<link>https://circleid.com/posts20160322_v12_group_sustains_customer_satisfaction_by_deploying_powermta</link>
		<description><![CDATA[With more than 8,000 platform users, 85 percent of which are brand-name retailers, reaching out to 110M US households, V12 needed an MTA (Messaging Transfer Agent) that would execute high delivery rates, offer more control, and easily enable the latest authentication protocols. <a href="https://circleid.com/posts20160322_v12_group_sustains_customer_satisfaction_by_deploying_powermta">More...</a>]]></description>
		<dc:date>2026-04-14T11:21:00-07:00</dc:date>
	</item>
	
	<item>
		<title> PowerMTA Now Offers Scheduled Delivery Control (Featured Blog)</title>
		<guid isPermaLink="true">https://circleid.com/posts20160126_powermta_now_offers_scheduled_delivery_control</guid>
		<link>https://circleid.com/posts20160126_powermta_now_offers_scheduled_delivery_control</link>
		<description><![CDATA[In PowerMTA v4.5 and later versions messages can now be scheduled for delivery. The feature allows for scheduling multiple delivery windows. <a href="https://circleid.com/posts20160126_powermta_now_offers_scheduled_delivery_control">More...</a>]]></description>
		<dc:date>2026-04-14T11:21:00-07:00</dc:date>
	</item>
	
	<item>
		<title> DKIM for ESPs: The Struggle of Living Up to the Ideal (Featured Blog)</title>
		<guid isPermaLink="true">https://circleid.com/posts20151204_dkim_for_esps_the_struggle_of_living_up_to_the_ideal</guid>
		<link>https://circleid.com/posts20151204_dkim_for_esps_the_struggle_of_living_up_to_the_ideal</link>
		<description><![CDATA[Given the increase in email fraud (phishing) and an increasingly complex email landscape, it is increasingly important for email service providers to implement email authentication properly. <a href="https://circleid.com/posts20151204_dkim_for_esps_the_struggle_of_living_up_to_the_ideal">More...</a>]]></description>
		<dc:date>2026-04-14T11:21:00-07:00</dc:date>
	</item>
	
	<item>
		<title> Reactivation Campaign: Shared vs. Dedicated IPs (Featured Blog)</title>
		<guid isPermaLink="true">https://circleid.com/posts20151202_reactivation_campaign_shared_vs_dedicated_ips</guid>
		<link>https://circleid.com/posts20151202_reactivation_campaign_shared_vs_dedicated_ips</link>
		<description><![CDATA[Within the digital messaging industry, an opportunity will sometimes arise for an email marketing manager to send a re-activation campaign to dormant email addresses, in order to galvanize subscribers who don't respond to your messaging. <a href="https://circleid.com/posts20151202_reactivation_campaign_shared_vs_dedicated_ips">More...</a>]]></description>
		<dc:date>2026-04-14T11:21:00-07:00</dc:date>
	</item>
	
	<item>
		<title> To Where are Bounce Messages Sent? (Featured Blog)</title>
		<guid isPermaLink="true">https://circleid.com/posts20151118_to_where_are_bounce_messages_sent</guid>
		<link>https://circleid.com/posts20151118_to_where_are_bounce_messages_sent</link>
		<description><![CDATA[This seems to be one of the greatest mysteries to new postmasters. It can be confusing as the messages go to the SMTP MAIL FROM address, which can be different from, or the same as the from header. The key to understanding bounces (sometimes referred to as DSNs, Delivery Status Notifications or NDRs, Non-Delivery Reports) is that they should always be sent to the SMTP MAIL FROM address. Some mail platforms may not adhere to this rule, but most do. <a href="https://circleid.com/posts20151118_to_where_are_bounce_messages_sent">More...</a>]]></description>
		<dc:date>2026-04-14T11:21:00-07:00</dc:date>
	</item>
	
	<item>
		<title> An Open Source Perspective on Commercial MTAs (Featured Blog)</title>
		<guid isPermaLink="true">https://circleid.com/posts20151105_an_open_source_perspective_on_commercial_mtas</guid>
		<link>https://circleid.com/posts20151105_an_open_source_perspective_on_commercial_mtas</link>
		<description><![CDATA[It's always refreshing to obtain a different perspective, especially from the open-source community regarding email sending infrastructure. For those who are currently utilizing an open-source product, we thought this feedback from one of our constituents would be valuable for decision makers. <a href="https://circleid.com/posts20151105_an_open_source_perspective_on_commercial_mtas">More...</a>]]></description>
		<dc:date>2026-04-14T11:21:00-07:00</dc:date>
	</item>
	
	<item>
		<title> Five Essential PowerMTA Configuration Tips (Featured Blog)</title>
		<guid isPermaLink="true">https://circleid.com/posts20151102_five_essential_powermta_configuration_tips</guid>
		<link>https://circleid.com/posts20151102_five_essential_powermta_configuration_tips</link>
		<description><![CDATA[When asked what are the best configurations to use with PowerMTA? The answer is different for every region of the world. Configuration settings in the US will be vastly different than those in Europe for example, so global settings are not as effective. <a href="https://circleid.com/posts20151102_five_essential_powermta_configuration_tips">More...</a>]]></description>
		<dc:date>2026-04-14T11:21:00-07:00</dc:date>
	</item>
	
	<item>
		<title> What's New With Port25's PowerMTA v4.5 (Featured Blog)</title>
		<guid isPermaLink="true">https://circleid.com/posts20151028_what_is_new_with_port25_powermta_v45</guid>
		<link>https://circleid.com/posts20151028_what_is_new_with_port25_powermta_v45</link>
		<description><![CDATA[Port24 recently intruded PowerMTA v4.5 as a major new release of PowerMTA. It now includes a wide variety of new advanced features and functionalities that allow for greater flexibility and delivery control to help maximize overall performance and deliverability. <a href="https://circleid.com/posts20151028_what_is_new_with_port25_powermta_v45">More...</a>]]></description>
		<dc:date>2026-04-14T11:21:00-07:00</dc:date>
	</item>
	
	<item>
		<title> New Feature in PowerMTA v4.5: IP Based Rate Limiting (Featured Blog)</title>
		<guid isPermaLink="true">https://circleid.com/posts20150911_new_feature_in_powermta_v45_ip_based_rate_limiting</guid>
		<link>https://circleid.com/posts20150911_new_feature_in_powermta_v45_ip_based_rate_limiting</link>
		<description><![CDATA[One feature in PowerMTA's GA release of v4.5 is IP based Rate Limiting. The "source-ip-max-msg-rate" is specifically designed to give delivery engineers/admins additional control. <a href="https://circleid.com/posts20150911_new_feature_in_powermta_v45_ip_based_rate_limiting">More...</a>]]></description>
		<dc:date>2026-04-14T11:21:00-07:00</dc:date>
	</item>
	
	<item>
		<title> Case Study: Emergency Response Systems Rely on Timely Messaging Through PowerMTA (Featured Blog)</title>
		<guid isPermaLink="true">https://circleid.com/posts20150722_emergency_response_systems_rely_on_timely_messaging_powermta</guid>
		<link>https://circleid.com/posts20150722_emergency_response_systems_rely_on_timely_messaging_powermta</link>
		<description><![CDATA[Boasting delivery rates of over 5MM messages per hour, eAlert from MIS Sciences is United States' leading emergency alert notification system. An extremely reliable and flexible system was key for handling the delivery of several million high-priority messages each day. <a href="https://circleid.com/posts20150722_emergency_response_systems_rely_on_timely_messaging_powermta">More...</a>]]></description>
		<dc:date>2026-04-14T11:21:00-07:00</dc:date>
	</item>
	
	<item>
		<title> Port25 Announces Next Major Release of Its Email Delivery Solution, PowerMTA (Featured Blog)</title>
		<guid isPermaLink="true">https://circleid.com/posts20150707_port25_announces_next_major_release_of_its_email_delivery_solution</guid>
		<link>https://circleid.com/posts20150707_port25_announces_next_major_release_of_its_email_delivery_solution</link>
		<description><![CDATA[Port25 separates itself further from the competition with the release of PowerMTA v4.5, and one of the noteworthy options in this release is Scheduled Delivery Control. <a href="https://circleid.com/posts20150707_port25_announces_next_major_release_of_its_email_delivery_solution">More...</a>]]></description>
		<dc:date>2026-04-14T11:21:00-07:00</dc:date>
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