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determine smtp server for a given email address python smtplib

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1

Given an email address is it possible to determine what the smtp address is using python. I am building an email application using python smtplib.

Thanks

python dns smtp smtplib mx-record

share|improve this question

edited Mar 26 at 9:03

Florian Weimer

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asked Mar 25 at 20:26

the_big_blackboxthe_big_blackbox

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add a comment | 

1

Given an email address is it possible to determine what the smtp address is using python. I am building an email application using python smtplib.

Thanks

python dns smtp smtplib mx-record

share|improve this question

edited Mar 26 at 9:03

Florian Weimer

19k33 gold badges1212 silver badges4949 bronze badges

asked Mar 25 at 20:26

the_big_blackboxthe_big_blackbox

35377 silver badges2121 bronze badges

add a comment | 

Given an email address is it possible to determine what the smtp address is using python. I am building an email application using python smtplib.

Thanks

python dns smtp smtplib mx-record

share|improve this question

edited Mar 26 at 9:03

Florian Weimer

19k33 gold badges1212 silver badges4949 bronze badges

asked Mar 25 at 20:26

the_big_blackboxthe_big_blackbox

35377 silver badges2121 bronze badges

share|improve this question

edited Mar 26 at 9:03

Florian Weimer

19k33 gold badges1212 silver badges4949 bronze badges

asked Mar 25 at 20:26

the_big_blackboxthe_big_blackbox

35377 silver badges2121 bronze badges

share|improve this question

edited Mar 26 at 9:03

Florian Weimer

19k33 gold badges1212 silver badges4949 bronze badges

asked Mar 25 at 20:26

the_big_blackboxthe_big_blackbox

35377 silver badges2121 bronze badges

edited Mar 26 at 9:03

Florian Weimer

19k33 gold badges1212 silver badges4949 bronze badges

edited Mar 26 at 9:03

Florian Weimer

19k33 gold badges1212 silver badges4949 bronze badges

asked Mar 25 at 20:26

the_big_blackboxthe_big_blackbox

35377 silver badges2121 bronze badges

asked Mar 25 at 20:26

the_big_blackboxthe_big_blackbox

35377 silver badges2121 bronze badges

1 Answer
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The Python smtplib module does not perform mail routing, so it leaves that to a smart host.

You could use dnspython to look up MX records for the destination domain (and A and AAAA records if there is no MX record). The resulting address you can then pass to smtplib.

However, this is only a small fraction of the work that is needed to implement proper mail routing: If the target mail server is unreachable or times out, you are supposed to try the next server. Similarly if it responds with a 4xx error code. If all servers are unavailable, you need to temporarily store the message locally, so you need to implement your own mail queue. Furthermore, your external IP address may be blacklisted for mail delivery.

Therefore, it is usually easier to install a local mail server such as Exim or Postfix and use that to inject mail, possibly routing it via a smart host with good email reputation to avoid blacklisting.

share|improve this answer

answered Mar 26 at 9:07

Florian WeimerFlorian Weimer

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1

The Python smtplib module does not perform mail routing, so it leaves that to a smart host.

You could use dnspython to look up MX records for the destination domain (and A and AAAA records if there is no MX record). The resulting address you can then pass to smtplib.

However, this is only a small fraction of the work that is needed to implement proper mail routing: If the target mail server is unreachable or times out, you are supposed to try the next server. Similarly if it responds with a 4xx error code. If all servers are unavailable, you need to temporarily store the message locally, so you need to implement your own mail queue. Furthermore, your external IP address may be blacklisted for mail delivery.

Therefore, it is usually easier to install a local mail server such as Exim or Postfix and use that to inject mail, possibly routing it via a smart host with good email reputation to avoid blacklisting.

share|improve this answer

answered Mar 26 at 9:07

Florian WeimerFlorian Weimer

19k33 gold badges1212 silver badges4949 bronze badges

add a comment | 

1

The Python smtplib module does not perform mail routing, so it leaves that to a smart host.

You could use dnspython to look up MX records for the destination domain (and A and AAAA records if there is no MX record). The resulting address you can then pass to smtplib.

However, this is only a small fraction of the work that is needed to implement proper mail routing: If the target mail server is unreachable or times out, you are supposed to try the next server. Similarly if it responds with a 4xx error code. If all servers are unavailable, you need to temporarily store the message locally, so you need to implement your own mail queue. Furthermore, your external IP address may be blacklisted for mail delivery.

Therefore, it is usually easier to install a local mail server such as Exim or Postfix and use that to inject mail, possibly routing it via a smart host with good email reputation to avoid blacklisting.

share|improve this answer

answered Mar 26 at 9:07

Florian WeimerFlorian Weimer

19k33 gold badges1212 silver badges4949 bronze badges

add a comment | 

The Python smtplib module does not perform mail routing, so it leaves that to a smart host.

You could use dnspython to look up MX records for the destination domain (and A and AAAA records if there is no MX record). The resulting address you can then pass to smtplib.

However, this is only a small fraction of the work that is needed to implement proper mail routing: If the target mail server is unreachable or times out, you are supposed to try the next server. Similarly if it responds with a 4xx error code. If all servers are unavailable, you need to temporarily store the message locally, so you need to implement your own mail queue. Furthermore, your external IP address may be blacklisted for mail delivery.

Therefore, it is usually easier to install a local mail server such as Exim or Postfix and use that to inject mail, possibly routing it via a smart host with good email reputation to avoid blacklisting.

share|improve this answer

answered Mar 26 at 9:07

Florian WeimerFlorian Weimer

19k33 gold badges1212 silver badges4949 bronze badges

share|improve this answer

answered Mar 26 at 9:07

Florian WeimerFlorian Weimer

19k33 gold badges1212 silver badges4949 bronze badges

answered Mar 26 at 9:07

Florian WeimerFlorian Weimer

19k33 gold badges1212 silver badges4949 bronze badges

answered Mar 26 at 9:07

Florian WeimerFlorian Weimer

19k33 gold badges1212 silver badges4949 bronze badges