Thanks for the article, it was also interesting and inspiring to see your other ventures in diverse fields. Would like to connect 1:1 in the near future. Meanwhile, even I had done a similar comparison as I myself handle email marketing for my organization. Do check it out as well as for the readers of the blog since it covers 2 additional players.
With Vero, users can track and store customer data and events in real-time. Using this information, you can create segments without having to do any coding and send out automated emails. For example, users who have just abandoned the shopping cart can be targeted with an email just hours or days later. In terms of deployment, Vero can be integrated with an email delivery provider, such as Sendgrid.

Email marketing solutions run the gamut from basic text-based email editors to fully designed HTML or JavaScript templates. Leveraging email for marketing can take several forms, so some packages will attempt to address all of them while others will seek to specialize. For example, some businesses might decide their most effective marketing tactic is a value-add newsletter delivered to a gated community of subscribers. Others might want to tie their emails directly to their product and sales engines, providing special offers and deals to recipients.
When it comes to Zapier integrations, not all of them are created equal. Every ‘zap’ (integration) has two parts: A trigger and an action. For example, let’s say you want to build an integration so that every time someone subscribes to your mailing list (the trigger), they’re automatically added to a Google Spreadsheet (the action), this can be built in minutes using Zapier.

First of all, BuzzFeed has awesome subject lines and preview text. They are always short and punchy -- which fits in perfectly with the rest of BuzzFeed's content. I especially love how the preview text will accompany the subject line. For example, if the subject line is a question, the preview text is the answer. Or if the subject line is a command (like the one below), the preview text seems like the next logical thought right after it:
Keep the subject line and pre-header short: The subject line is crucial. Keep it short so the reader knows exactly what the email topic is about. And the pre-header text (also known as snippet text), don’t let it go to waste by using “To view this email in your browser…”. Instead, summarize the email or include a call to action (i.e., Use “FREESHIP” to get free shipping).