You may have had problems sending email from any IP address between 82.224.0.0 and 82.255.255.255.
If this is the first you have heard of Proxad's email issue, I am very sorry to bring you unwelcome news. I hope you can accept my apology. I hope you can understand nobody says it's your fault. You just use an Internet company that operates irresponsibly.
Proxad lets their customers send all the junk email they want. Their customers have computers full of trojans and viruses and they do not help remove them. In the well-run parts of the Internet, that's considered irresponsible. It's very destructive and it costs everyone a lot of time and money.
These spam messages are usually relayed illegally through Microsoft PCs with trojan infections, connected to consumer broadband services such as DSL or cable modem.
Proxad absoloutely refuses to talk to anyone about the flood of network abuse coming from their customers. Perhaps there is a cultural issue. Perhaps they are seeking revenge for the flood of spam from irresponsible US networks like SBC and MCI. Perhaps the "language barrier" is real. The reason doesn't matter.
Since spammers are now able to use the 82.224.0.0/11 range freely, spammers have flocked there. Any message from a 82.224.0.0/11 network address or containing a URL hosted in that address range is practically guaranteed to be spam. Therefore it is no longer reasonable to expect responsibly-run networks to accept email from there.
Networks worldwide are blocking 82.224.0.0/11 address space from SMTP contact.
If you are in that stinking swamp and you need to send mail outside of your country, get a Mail.com or Mailshell.com account. (I do not advise anyone use Hotmail or Yahoo. Those companies are not trustworthy.) If you're "technical", get a Freeshell.org account. You will need it to send reliably to the rest of the world. Proxad will have poor email connections for years to come, even if they start cleaning up today. You should complain to your government about your Internet provider's outrageous, arrogant, and foolish behavior.
If 1% of the 24 million businesses in the United States sent you a spam once a year, your email would be unusable. It would not matter at all if they had "opt-out" provisions.
To prevent the email system as we know it from being destroyed, responsible Internet access providers do not allow spamming. "Opt-out" is irrelevant.
If you had a legitimate reason to send email to a domain I serve, you can
If you find this policy inconvenient, your complaint is with with YOUR INTERNET SERVICE PROVIDER, not with the well-run parts of the Internet that don't want their customers' abuse. Pick up the telephone and talk to them. Tell them you are not satisfied with the stinking contaminated IP address they gave you.