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Postfix might be a bit more popular than Campaign Monitor. We know about 1 link to it since March 2021 and only 1 link to Campaign Monitor. We are tracking product recommendations and mentions on various public social media platforms and blogs. They can help you identify which product is more popular and what people think of it.
According to campaignmonitor, the Return on investment in email marketing is 4400%. This implies a $44 return on every $1 spent. Also according to Direct Marketing Association, 66% of consumers have made a purchase online due to an email marketing message they have received in the past. Source: almost 2 years ago
Read the documentation on postfix.org and/or buy one of the many available Postfix books (it really helps to understand the Postfix philosophy). Source: about 3 years ago
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Exim - Exim is a message transfer agent (MTA) developed at the University of Cambridge for use on Unix systems connected to the Internet.