page = krebs on security – in-depth security news and …

url = https://krebsonsecurity.com analysed @ 2021-11-27 00:08 UTC

All except Level 3 Communications , a major Internet backbone provider acquired by Lumen/CenturyLink.
“LEVEL 3 is the last IRR operator which allows the use of this method, although they have discouraged its use since at least 2012,” Korab told KrebsOnSecurity. “Other IRR operators have fully deprecated MAIL-FROM.”