Shared IPs are generally recommended for new senders, those with low sending volumes (typically under 50,000 emails per month), or those who aren't ready to send frequently and consistently. They offer lower costs, ease of setup, and a shared IP reputation, making deliverability less dependent on individual sending practices. Shared IPs also assist in initial testing, warming up new domains/IPs, and for situations where consistent sending is not possible. Conversely, using shared IPs to send content known to negatively impact deliverability or to circumvent reputation problems associated with dedicated IPs is strongly discouraged.