@virelin thanks for your message!
Campation Postoffice comes with its own sending technology (SpeedMail) which makes smtp superfluous.
Nevertheless, you can use 1 SMTP server in the free version, e.g. as a fall-back server – but this is actually not necessary. If, for whatever reason, you actually want to use more than 1 SMTP server, we recommend trying one of our PRO versions. These allow the use of more SMTP servers. See also “Why PRO?” in the Campation Postoffice menu. Please get in touch if you need more information!
@campation thanks for your super quick reply! I need several SMTP servers because I want to organize sending via email sub-domains – I just looked in “why pro” and saw that this function is even integrated in PostOffice (DomainProtect) – so I’ll test your PRO version right away ! If I still need help, I’ll get back to you. Great plugin – great support!