swaks를 사용한 SMTP이메일 전송 테스트 방법

Honggi An

— 1 min read

SMTP 서버를 테스트 할 때 다른 여러 방법도 있지만 전용 프로그램을 사용해서 하면 잘 안될 경우에 어떤 문제인지 확인할 수도 있고 더 생산적이라고 생각한다.

swaks --to admin@myfirstbusiness.co.kr \
  --from admin@myfirstbusiness.co.kr \
  --server email-smtp.ap-northeast-2.amazonaws.com \
  --port 587 \
  --auth LOGIN \
  --auth-user 'AKIASUGLFGUII3QHVQO6' \
  --auth-password 'XXX' \
  --tls

=== Trying email-smtp.ap-northeast-2.amazonaws.com:587...
=== Connected to email-smtp.ap-northeast-2.amazonaws.com.
<-  220 email-smtp.amazonaws.com ESMTP SimpleEmailService-d-64SISH78D kz3ibSdUm2M6GXaZJeX5
 -> EHLO localhost
<-  250-email-smtp.amazonaws.com
<-  250-8BITMIME
<-  250-STARTTLS
<-  250-AUTH PLAIN LOGIN
<-  250 Ok
 -> STARTTLS
<-  220 Ready to start TLS
=== TLS started with cipher TLSv1.3:TLS_AES_256_GCM_SHA384:256
=== TLS no local certificate set
=== TLS peer DN="/CN=email-smtp.ap-northeast-2.amazonaws.com"
 ~> EHLO localhost
<~  250-email-smtp.amazonaws.com
<~  250-8BITMIME
<~  250-STARTTLS
<~  250-AUTH PLAIN LOGIN
<~  250 Ok
 ~> AUTH LOGIN
<~  334 VXNlcm5hbWU6
 ~> QUtJQVNVR0xGR1VJSTNRSFZRTzY=
<~  334 UGFzc3dvcmQ6
 ~> QkNTZCtraGVKc3FBMXRLZVB1WGJzc29weklVY1BnU0ZXSUZOMEVrMUd2NXk=
<~  235 Authentication successful.
 ~> MAIL FROM:<admin@myfirstbusiness.co.kr>
<~  250 Ok
 ~> RCPT TO:<admin@myfirstbusiness.co.kr>
<~  250 Ok
 ~> DATA
<~  354 End data with <CR><LF>.<CR><LF>
 ~> Date: Tue, 29 Jul 2025 11:54:44 +0900
 ~> To: admin@myfirstbusiness.co.kr
 ~> From: admin@myfirstbusiness.co.kr
 ~> Subject: test Tue, 29 Jul 2025 11:54:44 +0900
 ~> Message-Id: <20250729115444.301807@localhost>
 ~> X-Mailer: swaks v20201014.0 jetmore.org/john/code/swaks/
 ~> 
 ~> This is a test mailing
 ~> 
 ~> 
 ~> .
<~  250 Ok 010c0198541a92ea-1d2445cc-3730-408b-a7a2-1d92a5402882-000000
 ~> QUIT
<~  221 Bye
=== Connection closed with remote host.

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