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Can MTA send mail via a relay without being told so?
The Next CEO of Stack Overflowrelay mail from one postfix server to anotherZimbra doesn't send mail via smtp relay anmorePostfix: 'Relay access denied' - all incoming mail is rejectedSetting up SPF and initial questionsUsing SPF for spoof protectionCan't send mail from own server to GoogleAllowing a partially trusted server to send mail for one given address via SPF / DKIMSPF with -all includes directive with ~all?Setting SPF record for mail relay servers to avoid softfailSPF setup for mail and relay server
I'm thinking of adding an SPF to a domain. So I'm concerned if there are circumstances under which my MTA would use some relay when sending mail. Like, when the destination servers are too busy or something? I'm mainly interested in postfix's or exim's default settings.
email postfix exim spf
asked 2 days ago
x-yurix-yuri
433715
add a comment |
I'm thinking of adding an SPF to a domain. So I'm concerned if there are circumstances under which my MTA would use some relay when sending mail. Like, when the destination servers are too busy or something? I'm mainly interested in postfix's or exim's default settings.
email postfix exim spf
asked 2 days ago
x-yurix-yuri
433715
On the sending site MTAs can use long chains of relays, that’s typical In an enterprise setting, passing through site local installations, enterprise Gateways, spam filters and possibly a public cloud/isp service for sending, The chain is however configured or enforced privately. Once the public MTA sends it only picks a primary or secondary MX. It is not uncommon to use secondary MXs of your provider and your filtering must deal with it. It is however something you configure with your MX DNS records, so it is configured by the recipient admins.
– eckes
2 days ago
add a comment |
I'm thinking of adding an SPF to a domain. So I'm concerned if there are circumstances under which my MTA would use some relay when sending mail. Like, when the destination servers are too busy or something? I'm mainly interested in postfix's or exim's default settings.
email postfix exim spf
asked 2 days ago
x-yurix-yuri
433715
I'm thinking of adding an SPF to a domain. So I'm concerned if there are circumstances under which my MTA would use some relay when sending mail. Like, when the destination servers are too busy or something? I'm mainly interested in postfix's or exim's default settings.
email postfix exim spf
email postfix exim spf
asked 2 days ago
x-yurix-yuri
433715
asked 2 days ago
x-yurix-yuri
433715
asked 2 days ago
x-yurix-yuri
433715
asked 2 days ago
x-yurix-yuri
433715
asked 2 days ago
x-yurix-yuri
433715
433715
On the sending site MTAs can use long chains of relays, that’s typical In an enterprise setting, passing through site local installations, enterprise Gateways, spam filters and possibly a public cloud/isp service for sending, The chain is however configured or enforced privately. Once the public MTA sends it only picks a primary or secondary MX. It is not uncommon to use secondary MXs of your provider and your filtering must deal with it. It is however something you configure with your MX DNS records, so it is configured by the recipient admins.
– eckes
2 days ago
add a comment |
On the sending site MTAs can use long chains of relays, that’s typical In an enterprise setting, passing through site local installations, enterprise Gateways, spam filters and possibly a public cloud/isp service for sending, The chain is however configured or enforced privately. Once the public MTA sends it only picks a primary or secondary MX. It is not uncommon to use secondary MXs of your provider and your filtering must deal with it. It is however something you configure with your MX DNS records, so it is configured by the recipient admins.
– eckes
2 days ago
On the sending site MTAs can use long chains of relays, that’s typical In an enterprise setting, passing through site local installations, enterprise Gateways, spam filters and possibly a public cloud/isp service for sending, The chain is however configured or enforced privately. Once the public MTA sends it only picks a primary or secondary MX. It is not uncommon to use secondary MXs of your provider and your filtering must deal with it. It is however something you configure with your MX DNS records, so it is configured by the recipient admins.
– eckes
2 days ago
On the sending site MTAs can use long chains of relays, that’s typical In an enterprise setting, passing through site local installations, enterprise Gateways, spam filters and possibly a public cloud/isp service for sending, The chain is however configured or enforced privately. Once the public MTA sends it only picks a primary or secondary MX. It is not uncommon to use secondary MXs of your provider and your filtering must deal with it. It is however something you configure with your MX DNS records, so it is configured by the recipient admins.
– eckes
2 days ago
add a comment |
2 Answers
2
active
oldest
votes
No, if you don’t configure any relay (and don’t fiddle around on the network layer) , an MTA will try to deliver to whatever DNS says should get the mail.
answered 2 days ago
Sven♦Sven
87.5k10148200
add a comment |
I'm concerned if there are circumstances under which my MTA would use
some relay when sending mail.
No. Your server will attempt to send email to the server whose host is described by the MX record(s) for the destination domain.
edited 2 days ago
Lightness Races in Orbit
275416
answered 2 days ago
joeqwertyjoeqwerty
96.5k465149
add a comment |
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2 Answers
2
active
oldest
votes
2 Answers
2
active
oldest
votes
active
oldest
votes
active
oldest
votes
No, if you don’t configure any relay (and don’t fiddle around on the network layer) , an MTA will try to deliver to whatever DNS says should get the mail.
answered 2 days ago
Sven♦Sven
87.5k10148200
add a comment |
No, if you don’t configure any relay (and don’t fiddle around on the network layer) , an MTA will try to deliver to whatever DNS says should get the mail.
answered 2 days ago
Sven♦Sven
87.5k10148200
add a comment |
No, if you don’t configure any relay (and don’t fiddle around on the network layer) , an MTA will try to deliver to whatever DNS says should get the mail.
answered 2 days ago
Sven♦Sven
87.5k10148200
No, if you don’t configure any relay (and don’t fiddle around on the network layer) , an MTA will try to deliver to whatever DNS says should get the mail.
answered 2 days ago
Sven♦Sven
87.5k10148200
answered 2 days ago
Sven♦Sven
87.5k10148200
answered 2 days ago
Sven♦Sven
87.5k10148200
answered 2 days ago
Sven♦Sven
87.5k10148200
87.5k10148200
add a comment |
add a comment |
I'm concerned if there are circumstances under which my MTA would use
some relay when sending mail.
No. Your server will attempt to send email to the server whose host is described by the MX record(s) for the destination domain.
edited 2 days ago
Lightness Races in Orbit
275416
answered 2 days ago
joeqwertyjoeqwerty
96.5k465149
add a comment |
I'm concerned if there are circumstances under which my MTA would use
some relay when sending mail.
No. Your server will attempt to send email to the server whose host is described by the MX record(s) for the destination domain.
edited 2 days ago
Lightness Races in Orbit
275416
answered 2 days ago
joeqwertyjoeqwerty
96.5k465149
add a comment |
I'm concerned if there are circumstances under which my MTA would use
some relay when sending mail.
No. Your server will attempt to send email to the server whose host is described by the MX record(s) for the destination domain.
edited 2 days ago
Lightness Races in Orbit
275416
answered 2 days ago
joeqwertyjoeqwerty
96.5k465149
I'm concerned if there are circumstances under which my MTA would use
some relay when sending mail.
No. Your server will attempt to send email to the server whose host is described by the MX record(s) for the destination domain.
edited 2 days ago
Lightness Races in Orbit
275416
answered 2 days ago
joeqwertyjoeqwerty
96.5k465149
edited 2 days ago
Lightness Races in Orbit
275416
edited 2 days ago
Lightness Races in Orbit
275416
edited 2 days ago
Lightness Races in Orbit
275416
275416
answered 2 days ago
joeqwertyjoeqwerty
96.5k465149
answered 2 days ago
joeqwertyjoeqwerty
96.5k465149
answered 2 days ago
joeqwertyjoeqwerty
96.5k465149
96.5k465149
add a comment |
add a comment |
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On the sending site MTAs can use long chains of relays, that’s typical In an enterprise setting, passing through site local installations, enterprise Gateways, spam filters and possibly a public cloud/isp service for sending, The chain is however configured or enforced privately. Once the public MTA sends it only picks a primary or secondary MX. It is not uncommon to use secondary MXs of your provider and your filtering must deal with it. It is however something you configure with your MX DNS records, so it is configured by the recipient admins.
– eckes
2 days ago