US 11,916,858 B1
Method and system for outbound spam mitigation
John Mears, Oxfordshire (GB); and Brett Hunter Cove, British Columbia (CA)
Assigned to Sophos Limited, Abingdon (GB)
Filed by Sophos Limited, Abingdon (GB)
Filed on Sep. 30, 2022, as Appl. No. 17/958,046.
Int. Cl. H04L 51/214 (2022.01); H04L 51/212 (2022.01); H04L 61/5061 (2022.01); H04L 9/40 (2022.01); H04L 51/224 (2022.01)
CPC H04L 51/214 (2022.05) [H04L 51/212 (2022.05); H04L 51/224 (2022.05); H04L 61/5061 (2022.05); H04L 63/10 (2013.01); H04L 2463/082 (2013.01)] 14 Claims
OG exemplary drawing
 
1. A method for mitigating outbound electronic message spam, comprising:
determining, by one or more processors of a computer system, whether an outbound electronic message to a recipient sent from an electronic messaging account of a sender has at least a predetermined number of indicators of compromise, wherein determining whether the outbound electronic message includes at least the predetermined number of indicators of compromise includes:
determining, by the one or more processors, whether a database containing senders known to have sent one or more spam precursor electronic messages includes the sender of the outbound electronic message; and/or
determining, by the one or more processors, whether a database containing recipients of the one or more spam precursor electronic messages includes the recipient of the outbound electronic message;
sending, by the one or more processors, the outbound electronic message to the recipient using an Internet Protocol (IP) address from a first pool of service delivery IP addresses in response to a determination that the outbound electronic message has less than the predetermined number of indicators of compromise; and
sending, by the one or more processors, the outbound electronic message to the recipient using an IP address from a second pool of service delivery IP addresses in response to a determination that the outbound electronic message has at least the predetermined number of indicators of compromise.