I am not an IT expert, but just a end user, so please disregard any misuse of the technical vocabulary.
We have a dynamic IP (I deem this term is right) from our ISP. Since last week, we can not send email using Outlook Express. Everytime that we click "send all" we obtain the following error message (sorry, is in Spanish):
"El mensaje no se pudo enviar, el servidor rechazÃ³ la direcciÃ³n de correo electrÃ³nic"o del remitente: "ejmr[at]magyas.onored.com". Asunto 'Jeannie's NIE number', Cuenta: 'mail.magyas.onored.com', Servidor: 'mail.magyas.onored.com', Protocolo: SMTP, Respuesta del servidor: '550 mail not accepted from blacklisted IP address [126.96.36.199]', Puerto: 25, Seguridad (SSL): No, Error de servidor: 550, NÃºmero de error: 0x800CCC78"
We called our ISP helpline several times.
[at] 1st time: They informed us that we were blacklisted in Spamcop (we had another IP 188.8.131.52) , and referred us to deal direcly with Spamcop. I made a blackmail dispute listing
[at] 2nd time: We already have the current IP 184.108.40.206. They informed me that they will solve the problem. I do not know how, but they solved it in minutes.
[at]3rd time: I am told that if I want to avoid this kind of problem, I have to pay for a fixed IP (that are much more expensive that dynamic ones) otherwise they can not do anything.
We have updated AV solutions, and we have cross scanned with on-line tools, but we do not find anything wrong.
I am doubtful about who is blocking us? The people we send emails to.... or our own ISP? I have noticed that we do not obtain any feedback email message from any recipient, just the OE error window transcribed above when clicking the "send all buttom".
Any clarification will be welcomed.