[postfix] Fill missing header fields.

Gmail requires a `MessageId` header field. However, not all clients
set this field and gmail reject emails. This commit instructs
`postfix` to add missing headers fields (eg. `MessageId`).

diff --git a/postfix/main.cf b/postfix/main.cf
index 0e7c03dc6dc4977f77d95998f414a80b1a1e79d1..dbdc517a25d637dc8dba62790460eadc9cab7a81 100644 (file)
--- a/postfix/main.cf
+++ b/postfix/main.cf
@@ -24,3 +24,6 @@ smtpd_tls_cert_file = ${mail_ssl_cert_dir}/fullchain.pem
 smtpd_tls_key_file = ${mail_ssl_cert_dir}/privkey.pem
 smtpd_tls_mandatory_ciphers = high
 smtpd_tls_security_level = encrypt
+
+# Message rewrite
+always_add_missing_headers = yes