I decided to test the mailing service through SMTP.bz and was attracted by the possibility of free usage on the Free plan. Overall, my experience was successful, although there were some moments that raised questions. In the end, I decided to switch to a paid plan, as the price is quite reasonable, and we paid as a legal entity via invoice. The process of domain verification and connecting to SMTP seems straightforward, but it is implemented a bit inconveniently. In terms of functionality, everything is quite good: there are statistics with the option to export to XLS and CSV. This allows for tracking the results of the mailing and analyzing the statistics. Mailings are sent quickly, and there is also a feature for protecting the sender's reputation.
