9. A non-transitory computer program product for communication monitoring based on sentiment, the computer program product comprising: one or more non-transitory computer-readable storage media and program instructions stored on the one or more non-transitory computer-readable storage media, the program instructions comprising: program instructions to monitor a new communication prior to sending created by a sender to a recipient, wherein the new communication comprises text input by the sender; program instructions to analyze the text of the new communication using sentiment analysis and program instructions to determine a sentiment score on a scale between negative sentiment and positive sentiment; program instructions to reference an overall relationship score based on past communications between the sender and the recipient in response to the sentiment score for the text of the new communication being on a negative side of a first predefined threshold on the scale; program instructions to hold a transmission of the new communication or activating another action in response to the overall relationship score being on the negative side of a second predefined threshold in response to the overall relationship score being on the negative side of a second predefined threshold; and program instructions to send a notification to at least one of the sender or a supervisor of the sender in response to the overall relationship score being on the negative side of the second predefined threshold.
9. A non-transitory computer program product for communication monitoring based on sentiment, the computer program product comprising: one or more non-transitory computer-readable storage media and program instructions stored on the one or more non-transitory computer-readable storage media, the program instructions comprising: program instructions to monitor a new communication prior to sending created by a sender to a recipient, wherein the new communication comprises text input by the sender; program instructions to analyze the text of the new communication using sentiment analysis and program instructions to determine a sentiment score on a scale between negative sentiment and positive sentiment; program instructions to reference an overall relationship score based on past communications between the sender and the recipient in response to the sentiment score for the text of the new communication being on a negative side of a first predefined threshold on the scale; program instructions to hold a transmission of the new communication or activating another action in response to the overall relationship score being on the negative side of a second predefined threshold in response to the overall relationship score being on the negative side of a second predefined threshold; and program instructions to send a notification to at least one of the sender or a supervisor of the sender in response to the overall relationship score being on the negative side of the second predefined threshold. 16. The computer program product as claimed in claim 9 , further comprising: program instructions to select a signature for the communication from a plurality of signatures each having a different sentiment, wherein the program instructions to select is based on the sentiment score of the new communication.