Use the opensmtpd package as it was updated in guix
modules/config/mail.scm
112 | 112 | (define (lepiller-smtp-service interface domain) | |
113 | 113 | (service opensmtpd-service-type | |
114 | 114 | (opensmtpd-configuration | |
115 | - | (package opensmtpd-next) | |
116 | 115 | (config-file (opensmtpd-conf interface domain))))) | |
117 | 116 | ||
118 | 117 | (define (lepiller-dkim-service domain) |