Hi,
I’m not an expert at Regexs otherwise I’d look at this myself. I’ve had someone emailing me about problems getting mail through and at first glance it was due to an invalid HELO. At second glance, the HELO is actually valid and points to a domain that has a valid DNS record. The HELO is server.kalo.digital This fails the default regex for invalidFormatHeloRe because the regex stipulates that the last part of the HELO has to be between 2 and 6 characters long. This doesn’t take into account the more recent TLDs that have been forced on the Internet of which .digital is one being 7 characters. I can’t find anything in RFC1123 that specifically states the number of characters for the TLD so is this a problem with the Regex rather than the usage of TLDs with more than 6 characters? All the best, Colin Waring.
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