More and more people choose email marketing for online business promoting.Email marketing is cost-effective and fast to convey product information to our prospects. To send bulk emails, we need to choose the bulk email sender for tool and smtp server. BBmail smtp server is a good choice. According to my knowledge, it has DKIM, SPF and Sender ID settings to ensure that bulk mails can be sent safely. DKIM attaches a new domain name identifier to a message and uses cryptographic techniques to validate authorization for its presence. The identifier is independent of any other identifier in the message. Sender Policy Framework (SPF) is an email validation system which is designed to prevent email spam by detecting email spoofing, a common vulnerability, by verifying sender IP addresses. SPF allows administrators to specify which hosts are allowed to send mail from a given domain by creating a specific SPF record (or TXT record) in the Domain Name System (DNS). Mail exchangers will use the DNS to check that mail from a given domain is being sent by a host sanctioned by that domain's administrators. BBmail email marketing company has 20k daily and 50k daily email marketing packages . They have clients all over the world. It is worth to try and believe.