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Can MTA send mail via a relay without being told so?
The 2019 Stack Overflow Developer Survey Results Are Inrelay 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
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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 Mar 30 at 13:45
x-yurix-yuri
443716
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 Mar 30 at 13:45
x-yurix-yuri
443716
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
Mar 30 at 20:34
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 Mar 30 at 13:45
x-yurix-yuri
443716
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 Mar 30 at 13:45
x-yurix-yuri
443716
asked Mar 30 at 13:45
x-yurix-yuri
443716
asked Mar 30 at 13:45
x-yurix-yuri
443716
asked Mar 30 at 13:45
x-yurix-yuri
443716
asked Mar 30 at 13:45
x-yurix-yuri
443716
443716
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
Mar 30 at 20:34
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
Mar 30 at 20:34
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
Mar 30 at 20:34
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
Mar 30 at 20:34
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 Mar 30 at 13:53
Sven♦Sven
87.7k10148200
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 Mar 31 at 1:32
Lightness Races in Orbit
275416
answered Mar 30 at 16:53
joeqwertyjoeqwerty
96.6k465149
add a comment |
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2 Answers
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2 Answers
2
active
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active
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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 Mar 30 at 13:53
Sven♦Sven
87.7k10148200
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 Mar 30 at 13:53
Sven♦Sven
87.7k10148200
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 Mar 30 at 13:53
Sven♦Sven
87.7k10148200
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 Mar 30 at 13:53
Sven♦Sven
87.7k10148200
answered Mar 30 at 13:53
Sven♦Sven
87.7k10148200
answered Mar 30 at 13:53
Sven♦Sven
87.7k10148200
answered Mar 30 at 13:53
Sven♦Sven
87.7k10148200
87.7k10148200
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 Mar 31 at 1:32
Lightness Races in Orbit
275416
answered Mar 30 at 16:53
joeqwertyjoeqwerty
96.6k465149
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 Mar 31 at 1:32
Lightness Races in Orbit
275416
answered Mar 30 at 16:53
joeqwertyjoeqwerty
96.6k465149
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 Mar 31 at 1:32
Lightness Races in Orbit
275416
answered Mar 30 at 16:53
joeqwertyjoeqwerty
96.6k465149
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 Mar 31 at 1:32
Lightness Races in Orbit
275416
answered Mar 30 at 16:53
joeqwertyjoeqwerty
96.6k465149
edited Mar 31 at 1:32
Lightness Races in Orbit
275416
edited Mar 31 at 1:32
Lightness Races in Orbit
275416
edited Mar 31 at 1:32
Lightness Races in Orbit
275416
275416
answered Mar 30 at 16:53
joeqwertyjoeqwerty
96.6k465149
answered Mar 30 at 16:53
joeqwertyjoeqwerty
96.6k465149
answered Mar 30 at 16:53
joeqwertyjoeqwerty
96.6k465149
96.6k465149
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
Mar 30 at 20:34