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Tag: 550 5.1.11
| # | Post Title | Date | User |
| Sporadische 550 Recipient not found Fehler - x500-Adressen vorhanden | 10 months ago | alahandi | |
| 550 5.1.11 - bei externen Empfängern | 3 years ago | R0r3ch4ch | |
| Ex2016: 550 5.1.11 RESOLVER.ADR.ExRecipNotFound; Recipient not found by Exchange Legacy encapsulated email address lookup | 5 years ago | lcp | |