Soft Bounces: 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 flags you as a spammer to ISPs. Most reputable Email Service Providers (ESPs) will automatically suppress hard bounces, but monitoring this is essential.

Full Inbox: The recipient's mailbox is full and cannot receive new messages.
Server Down/Unavailable: The recipient's email server is temporarily offline or experiencing issues.
Message Too Large: The email exceeds the size limit set by the recipient's server.

Action: ESPs typically retry soft-bounced emails for a certain period. However, repeated soft bounces from the same address over multiple campaigns 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 re-engagement.
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 indonesia email list problem that needs immediate attention.
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 and call-to-action effectiveness, a low CTR can also indirectly point to a dirty list.

Definition: (Unique Clicks / Emails Delivered) * 100.
Connection to List Hygiene:
Irrelevant Content to an Unsegmented or Poorly Targeted List: If your list contains a broad mix of subscribers with diverse interests (a sign of poor initial list quality or outdated data), your generic content may not resonate with a large portion of them, leading to few clicks.
Subscribers Who No Longer Care: Even if they open your emails, if a significant segment of your list has become disengaged, they might skim and close without clicking, indicating their declining interest or the irrelevance of your offering. This often happens with old, uncleaned lists.
Emails Not Reaching the Inbox: If your emails are landing in spam, they won't be opened, and therefore, no one will click. Low CTR can thus be an indirect consequence of broader deliverability issues stemming from a dirty list.