В чем может быть приина подскажите:
2020-05-12 14:18:45 [36249] H=mx0a-002b8001.pphosted.com [148.163.151.9]:37336 I=[185.41.186.140]:25 F=<prvs=14017a2e6e=lborisova@ups.com> temporarily rejected RCPT <****>: Temporary recipient validation error (2). Try again later.
2020-05-12 14:18:45 [36249] H=mx0a-002b8001.pphosted.com [148.163.151.9]:37336 I=[185.41.186.140]:25 F=<prvs=14017a2e6e=lborisova@ups.com> temporarily rejected RCPT <****>: Temporary recipient validation error (2). Try again later.
2020-05-12 14:25:08 [36486] H=mx0a-002b8001.pphosted.com [148.163.151.9]:59492 I=[185.41.186.140]:25 F=<prvs=14017a2e6e=lborisova@ups.com> temporarily rejected RCPT <****>: Temporary recipient validation error (2). Try again later.
2020-05-12 14:33:40 [36944] H=mx0a-002b8001.pphosted.com [148.163.151.9]:22964 I=[185.41.186.140]:25 F=<prvs=14017a2e6e=lborisova@ups.com> temporarily rejected RCPT <****>: Temporary recipient validation error (2). Try again later.
2020-05-12 14:18:45 [36249] H=mx0a-002b8001.pphosted.com [148.163.151.9]:37336 I=[185.41.186.140]:25 F=<prvs=14017a2e6e=lborisova@ups.com> temporarily rejected RCPT <****>: Temporary recipient validation error (2). Try again later.
2020-05-12 14:18:45 [36249] H=mx0a-002b8001.pphosted.com [148.163.151.9]:37336 I=[185.41.186.140]:25 F=<prvs=14017a2e6e=lborisova@ups.com> temporarily rejected RCPT <****>: Temporary recipient validation error (2). Try again later.
2020-05-12 14:25:08 [36486] H=mx0a-002b8001.pphosted.com [148.163.151.9]:59492 I=[185.41.186.140]:25 F=<prvs=14017a2e6e=lborisova@ups.com> temporarily rejected RCPT <****>: Temporary recipient validation error (2). Try again later.
2020-05-12 14:33:40 [36944] H=mx0a-002b8001.pphosted.com [148.163.151.9]:22964 I=[185.41.186.140]:25 F=<prvs=14017a2e6e=lborisova@ups.com> temporarily rejected RCPT <****>: Temporary recipient validation error (2). Try again later.