phpList CEO here. Listmonk looks awesome - great to see more freedom of choice for Open Source Marketers.
Not sure what SMTP setup you had with phpList, but sending 1.5m messages on a VPS should take less than a day with the right Postfix tweaks.
Not sure what SMTP setup you had with phpList, but sending 1.5m messages on a VPS should take less than a day with the right Postfix tweaks.
We did try several things; Postfix tweaks, SES / Postal SMTPs, rate changes in the phpList config etc., but nothing seemed to work. This, along with the other factors (segmentation, dynamic templating), lead to listmonk.