3CX SMTP 5.7.0 Denied

[Mina Hanna]

Dears,
Kindly i have an issue on my 3cx server as it suddenly not send welcome mail and when i test SMTP server i found an error 5.7.0 Denied although I tested the public ip and its bounded to our 3cx FQDN So kindly advice.

 

[ChrisC_3CX]

When you say that the FQDN is bound to the correct IP do you mean that the FQDN resolves to that IP? Make sure that this is the case by first checking what IP the 3CX PBX has in "Dashboard >> Information >> IP", and then run an nslookup against google' s DNS (nslookup MyFQDN.3cx.com 8.8.8.8) to check if both IPs match.

Also, make sure the 3CX PBX can activate the License and that you do not get an error when trying to refresh the License Key Information by going into "Settings >> License and then click on "Refresh License Key Information".

 

[Mina Hanna]

Dear Support,
Thanks for your reply, Kindly i make test for my FQDN and its yes resolving to my real ip asper the above command example and also make refresh to my active license but the issue still exist and smtp server appear 5.7.0 Denied Kindly advice

 

[StefanW]

do you have multiple outbound IPs on your Firewall?

 

[Mina Hanna]

do you have multiple outbound IPs on your Firewall?

No i have only one ip

 

[ChrisC_3CX]

@Mina Hanna
I'll PM you shortly regarding this.

 

[Mina Hanna]

@Mina Hanna
I'll PM you shortly regarding this.

Okay, Thanks for your support

 

[ChrisC_3CX]

@Mina Hanna
As discussed via PM, we have discovered that the 3CX PBX in question was in fact contacting 3CX from an IP different from the on the FQDN resolves to.

You will have to make sure that the 3CX PBX is configured with the same IP that is accessing the Internet from.

Let us know how it goes!