Soft Bounces (Temporary): These indicate a temporary delivery issue

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Crucial Action: Hard-bounced addresses must be immediately and permanently removed from your mailing list. Sending to them repeatedly signals to ISPs that you are either using an old, uncleaned list or are intentionally sending to invalid addresses, which can lead to blacklisting. Most reputable Email Service Providers (ESPs) will automatically suppress hard bounces, but monitoring this is essential. If your ESP's dashboard shows a rising number of hard bounces, it's a critical alert.

Full Inbox: The recipient's mailbox is full and cannot philippines email list receive new messages. This is common for older accounts or those not regularly managed.
Server Down/Unavailable: The recipient's email server is temporarily offline or experiencing issues. This is usually transient.
Message Too Large: The email exceeds the size limit set by the recipient's server. This can happen with heavy attachments or image-rich emails for some older email systems.

Action: ESPs typically retry soft-bounced emails for a certain period However, repeated soft bounces from the same address over multiple campaigns (e.g., an address soft-bouncing for 3 consecutive sends) suggest a persistent problem and that the address might effectively be inactive or abandoned. If an address soft bounces consistently, it should eventually be considered for removal or a re-engagement campaign. While less damaging than hard bounces, a high volume of persistent soft bounces still indicates a segment of your list that isn't receiving your emails.

Thresholds: While acceptable bounce rates vary slightly by industry and campaign type, a general rule of thumb is to keep your total bounce rate below 2%. Anything consistently above this, especially due to hard bounces, signals a critical list hygiene problem that needs immediate attention. If your bounce rate jumps from 1% to 5% after importing a new segment, that segment is almost certainly dirty.

C. Low Click-Through Rates (CTR)
The Click-Through Rate (CTR) measures the percentage of people who clicked on a link within your email. While CTR is heavily influenced by content relevance, email design, and call-to-action effectiveness, a persistently low CTR can also indirectly point to a dirty list, particularly when other metrics like open rates are stable but still low.