Explicit prudence for badly behaved clients

.gitignore

.gitlab-ci.yml

Cargo.lock

samotop-core/Cargo.toml

samotop-core/src/io/dummy.rs

samotop-core/src/io/mod.rs

samotop-core/src/io/smtp.rs

samotop-core/src/io/tls/mod.rs

samotop-core/src/io/tls/notls.rs

samotop-core/src/io/tls/stream.rs

samotop-core/src/io/tls/traits.rs

samotop-core/src/lib.rs

samotop-core/src/mail/builder.rs

samotop-core/src/mail/debug.rs

samotop-core/src/mail/driver.rs

samotop-core/src/mail/esmtp.rs

samotop-core/src/mail/guard.rs

samotop-core/src/mail/mailservice.rs

samotop-core/src/mail/mod.rs

samotop-core/src/mail/name.rs