Mass Mailing: istruzioni per non essere blacklistati

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una breve guida al mass mailing:
– Usa solo indirizzi confermati
– Non comprare liste
– Segmenta il traffico
– Segmenta i tuoi destinatari
– Usa bassa tolleranza per le mail non richieste
– Limita il rate di invio a  “Friendly” levels
– DK sign
– Usa SPF / SenderID records
In generale :
1. Proper DNS PTR and A record for outbound delivery IP address(es).
2. Use of DomainKey and DKIM signature for better sender authentication.
3. Use SPF/SIDF if possible.
4. Rate limit by concurrent sessions and less than 500 messages per hour
to each destination domains per virtual gateway.
5. Limit default outgoing connections per domain to 10. Crank this up to
certain domains if everything appears OK and injection rates warrant it.
6. Configure appropriate bounce profile (retry schedule). Outgoing bounce profile should only attempt messages a couple of times – even a SINGLE attempt per message is often adequate. We default to 100 which is
way overkill for outbound mesages. Remember that this setting controls
reattempts after 4xx errors, not reattempts for downed hosts.
7. Consider limiting “max number of seconds in queue” for outgoing to 4 hours or less. If the system can’t reach the destination for that period you’re probably blacklisted there. Delay warning message can be sent to alert sender if needed. The default bounce profile also controls the “host retry” schedule. If you are going to limit the max time in queue to 4 hours, consider making the “maximum number of seconds to wait before retrying a host” 1800 == 30 minutes.
8. For marketing campaigns, update delivery list by reviewing the bounce log to remove the invalid destination addresses.
Destination control: – 8 concurrent connections, 15 recipients in 1 minutes – 10 concurrent connections, 25 recipients in 1 minutes – 20 concurrent connections, 100 in 5 minutes

I seting raccomandati si possono trovare qui:, and
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Antonio Ieranò
CSO, Cyber Security Architect, technical evangelist, consultant, writer, journalist and trainer
I am a Security Manager and architect, CSO, BDM, marketing specialist, and tech evangelist with over 20 years of experience serving as a community liaison, subject matter expert, and high-profile trainer for key technologies and solutions. My experience includes acting as the public face of Huawei technology and before Cisco security technologies; leading pan-European technical teams in development of new Cisco security products; and serving as a key public speaker and trainer on behalf of new high-tech products. My expertise spans IT development and implementation, marketing strategy, legal issues, and budget / financial management.

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