RE: smtp relay server security

2019-06-05 Thread De Petter Mattheas
Thx for the respons I have setup sasl auth by dovecot -Original Message- From: owner-postfix-us...@postfix.org On Behalf Of Viktor Dukhovni Sent: 03 June 2019 16:58 To: Postfix users Subject: Re: smtp relay server security > On Jun 3, 2019, at 9:02 AM, De Petter Matth

Re: smtp relay server security

2019-06-03 Thread Viktor Dukhovni
> On Jun 3, 2019, at 9:02 AM, De Petter Mattheas > wrote: > > For the moment we have a rule that only allow mail from exchange server > address to postfix (relay server), but when somebody spoofs this address mail > gets accept and you can send your mail to anybody as anybody. > > When I

Re: smtp relay server security

2019-06-03 Thread Jon Radel
On 6/3/19 10:31 AM, Matus UHLAR - fantomas wrote: > >>> For the moment we have a rule that only allow mail from exchange server >>> adres to postfix (relay server), >> >> show us. >> >> # mynetworks = xxx.xxx.xxx.xxx/32, 127.0.0.1/32 >> smtpd_recipient_restrictions = >> permit_mynetworks,reject_una

RE: smtp relay server security

2019-06-03 Thread De Petter Mattheas
ithout creating mailboxes on the server. Thanks for your advice. -Original Message- From: owner-postfix-us...@postfix.org On Behalf Of Matus UHLAR - fantomas Sent: 03 June 2019 16:32 To: postfix-users@postfix.org Subject: Re: smtp relay server security On 03.06.19 14:19, De Petter

Re: smtp relay server security

2019-06-03 Thread Matus UHLAR - fantomas
On 03.06.19 14:19, De Petter Mattheas wrote: Answers in after the # indenting the original answer usually giver much more readable result. outlook does support indenting... On 03.06.19 13:02, De Petter Mattheas wrote: How can we secure are postfix smtp relay server? complicated question...

RE: smtp relay server security

2019-06-03 Thread De Petter Mattheas
Hello Answers in after the # On 03.06.19 13:02, De Petter Mattheas wrote: >How can we secure are postfix smtp relay server? complicated question... >For the moment we have a rule that only allow mail from exchange server >adres to postfix (relay server), show us. # mynetworks = xxx.xxx.xxx.

Re: smtp relay server security

2019-06-03 Thread Matus UHLAR - fantomas
On 03.06.19 13:02, De Petter Mattheas wrote: How can we secure are postfix smtp relay server? complicated question... For the moment we have a rule that only allow mail from exchange server adres to postfix (relay server), show us. but when somebody spoofs this address mail gets accept an