Ao enviar e-mail para [email protected] através do meu próprio servidor SMTP (mail.sarit.be), o servidor de recebimento de mensagens responde com:
451 #4.1.8 Domain of sender address <[email protected]> does not resolve
A julgar pelo meu log de postfix, todo o servidor MX de recebimento não consegue resolver sarit.be ou mail.sarit.be.
;; QUESTION SECTION:
;terremark.com. IN MX
;; ANSWER SECTION:
terremark.com. 300 IN MX 15 fldsmtpe04.verizon.com.
terremark.com. 300 IN MX 15 fldsmtpe01.verizon.com.
terremark.com. 300 IN MX 15 fldsmtpe02.verizon.com.
terremark.com. 300 IN MX 15 fldsmtpe03.verizon.com.
Aug 6 08:47:42 charlie postfix/smtp[22257]: 2A45D2D56: to=<[email protected]>, relay=fldsmtpe01.verizon.com[140.108.26.140]:25, delay=418619, delays=418496/0.01/63/60, dsn=4.0.0, status=deferred (host fldsmtpe01.verizon.com[140.108.26.140] said: 451 #4.1.8 Domain of sender address <[email protected]> does not resolve (in reply to MAIL FROM command))
Aug 6 09:56:41 charlie postfix/smtp[22866]: 2A45D2D56: host fldsmtpe02.verizon.com[140.108.26.141] said: 451 #4.1.8 Domain of sender address <[email protected]> does not resolve (in reply to MAIL FROM command)
Aug 6 09:57:44 charlie postfix/smtp[22866]: 2A45D2D56: to=<[email protected]>, relay=fldsmtpe03.verizon.com[140.108.26.142]:25, delay=422821, delays=422697/0.01/64/60, dsn=4.0.0, status=deferred (host fldsmtpe03.verizon.com[140.108.26.142] said: 451 #4.1.8 Domain of sender address <[email protected]> does not resolve (in reply to MAIL FROM command))
Aug 6 11:06:42 charlie postfix/smtp[23660]: 2A45D2D56: host fldsmtpe01.verizon.com[140.108.26.140] said: 451 #4.1.8 Domain of sender address <[email protected]> does not resolve (in reply to MAIL FROM command)
Aug 6 11:07:44 charlie postfix/smtp[23660]: 2A45D2D56: to=<[email protected]>, relay=fldsmtpe03.verizon.com[140.108.26.142]:25, delay=427021, delays=426897/0.01/64/60, dsn=4.0.0, status=deferred (host fldsmtpe03.verizon.com[140.108.26.142] said: 451 #4.1.8 Domain of sender address <[email protected]> does not resolve (in reply to MAIL FROM command))
Aug 6 12:16:42 charlie postfix/smtp[24312]: 2A45D2D56: host fldsmtpe04.verizon.com[140.108.26.143] said: 451 #4.1.8 Domain of sender address <[email protected]> does not resolve (in reply to MAIL FROM command)
Aug 6 12:17:43 charlie postfix/smtp[24312]: 2A45D2D56: to=<[email protected]>, relay=fldsmtpe02.verizon.com[140.108.26.141]:25, delay=431221, delays=431097/0.01/63/60, dsn=4.0.0, status=deferred (host fldsmtpe02.verizon.com[140.108.26.141] said: 451 #4.1.8 Domain of sender address <[email protected]> does not resolve (in reply to MAIL FROM command))
Aug 6 13:26:42 charlie postfix/smtp[24956]: 2A45D2D56: host fldsmtpe02.verizon.com[140.108.26.141] said: 451 #4.1.8 Domain of sender address <[email protected]> does not resolve (in reply to MAIL FROM command)
Aug 6 13:27:43 charlie postfix/smtp[24956]: 2A45D2D56: to=<[email protected]>, relay=fldsmtpe04.verizon.com[140.108.26.143]:25, delay=435420, delays=435297/0.01/63/60, dsn=4.0.0, status=deferred (host fldsmtpe04.verizon.com[140.108.26.143] said: 451 #4.1.8 Domain of sender address <[email protected]> does not resolve (in reply to MAIL FROM command))
Aug 8 08:21:34 charlie postfix/smtp[15495]: 46D6E6353: host fldsmtpe03.verizon.com[140.108.26.142] said: 451 #4.1.8 Domain of sender address <[email protected]> does not resolve (in reply to MAIL FROM command)
Eu verifiquei a pesquisa reversa de DNS do meu servidor MX e o registro SPF do domínio sarit.be.
;; QUESTION SECTION:
;sarit.be. IN MX
;; ANSWER SECTION:
sarit.be. 3600 IN MX 10 mail.sarit.be.
;; QUESTION SECTION:
;mail.sarit.be. IN A
;; ANSWER SECTION:
mail.sarit.be. 2128 IN A 176.9.7.243
;; QUESTION SECTION:
;243.7.9.176.in-addr.arpa. IN PTR
;; ANSWER SECTION:
243.7.9.176.in-addr.arpa. 43200 IN PTR mail.sarit.be.
;; QUESTION SECTION:
;sarit.be. IN SPF
;; ANSWER SECTION:
sarit.be. 3600 IN SPF "v=spf1 +a +mx ~all"
Por fim, enviei o tráfego SMTP entre meu próprio servidor de e-mail e o outro servidor MX:
220 fldsmtpe01.verizon.com ESMTP
EHLO mail.sarit.be
250-fldsmtpe01.verizon.com
250-8BITMIME
250-SIZE 20971520
250 STARTTLS
MAIL FROM:<[email protected]> SIZE=537
451 #4.1.8 Domain of sender address <[email protected]> does not resolve
RSET
250 reset
QUIT
221 fldsmtpe01.verizon.com
Não vejo nada de errado com meu material de DNS. Não tenho problemas para enviar email para outros domínios. É fácil pensar que o erro está no servidor de recebimento de email. O que você acha?
PS: A coisa de DNS reverso não parece tão importante neste caso, porque quando eu envio e-mail de [email protected] para [email protected], o e-mail é aceito mesmo se a pesquisa direta / reversa para aqueles Os servidores MX não correspondem.
Isso parece um problema temporário de DNS no lado do recebimento. O servidor deles não consegue resolver seu endereço por algum motivo. Eu acho que nada pode ser feito para consertar isso do seu lado. Provavelmente, você deve entrar em contato com o representante deles usando outro e-mail e pedir a eles que resolvam esse problema.